diff --git a/gprMax/fields_update.pyx b/gprMax/fields_update.pyx
index af5b9ae2..41498681 100644
--- a/gprMax/fields_update.pyx
+++ b/gprMax/fields_update.pyx
@@ -19,7 +19,7 @@
 import numpy as np
 cimport numpy as np
 from cython.parallel import prange
-from .constants cimport floattype_t, complextype_t
+from gprMax.constants cimport floattype_t, complextype_t
 
 
 #########################################
diff --git a/gprMax/fractals.py b/gprMax/fractals.py
index 22d64fff..23446651 100644
--- a/gprMax/fractals.py
+++ b/gprMax/fractals.py
@@ -19,8 +19,8 @@
 import numpy as np
 np.seterr(divide='raise')
 
-from .constants import floattype, complextype
-from .utilities import rvalue
+from gprMax.constants import floattype, complextype
+from gprMax.utilities import rvalue
 
 
 class FractalSurface():
diff --git a/gprMax/geometry_primitives.pyx b/gprMax/geometry_primitives.pyx
index cded3eb0..1047fcd5 100644
--- a/gprMax/geometry_primitives.pyx
+++ b/gprMax/geometry_primitives.pyx
@@ -19,8 +19,8 @@
 import numpy as np
 cimport numpy as np
 np.seterr(divide='raise')
-from .utilities import rvalue
-from .yee_cell_setget_rigid cimport set_rigid_Ex, set_rigid_Ey, set_rigid_Ez, set_rigid_Hx, set_rigid_Hy, set_rigid_Hz, set_rigid_E, unset_rigid_E, set_rigid_H, unset_rigid_H
+from gprMax.utilities import rvalue
+from gprMax.yee_cell_setget_rigid cimport set_rigid_Ex, set_rigid_Ey, set_rigid_Ez, set_rigid_Hx, set_rigid_Hy, set_rigid_Hz, set_rigid_E, unset_rigid_E, set_rigid_H, unset_rigid_H
 
 
 cpdef bint are_clockwise(float v1x, float v1y, float v2x, float v2y):
diff --git a/gprMax/geometry_views.py b/gprMax/geometry_views.py
index 649f7c2f..51d0954d 100644
--- a/gprMax/geometry_views.py
+++ b/gprMax/geometry_views.py
@@ -20,7 +20,7 @@ import sys
 import numpy as np
 from struct import pack
 
-from .utilities import rvalue
+from gprMax.utilities import rvalue
 
 
 class GeometryView:
diff --git a/gprMax/gprMax.py b/gprMax/gprMax.py
index 7787c919..04bf7556 100644
--- a/gprMax/gprMax.py
+++ b/gprMax/gprMax.py
@@ -31,20 +31,20 @@ from enum import Enum
 
 import numpy as np
 
-from .constants import e0
-from .exceptions import CmdInputError
-from .fields_output import prepare_output_file, write_output
-from .fields_update import *
-from .grid import FDTDGrid
-from .input_cmds_geometry import process_geometrycmds
-from .input_cmds_file import python_code_blocks, write_python_processed, check_cmd_names
-from .input_cmds_multiuse import process_multicmds
-from .input_cmds_singleuse import process_singlecmds
-from .materials import Material
-from .pml_call_updates import update_pml_electric, update_pml_magnetic
-from .pml import build_pml, calculate_initial_pml_params
-from .utilities import update_progress, logo, human_size
-from .yee_cell_build import build_ex_component, build_ey_component, build_ez_component, build_hx_component, build_hy_component, build_hz_component
+from gprMax.constants import e0
+from gprMax.exceptions import CmdInputError
+from gprMax.fields_output import prepare_output_file, write_output
+from gprMax.fields_update import *
+from gprMax.grid import FDTDGrid
+from gprMax.input_cmds_geometry import process_geometrycmds
+from gprMax.input_cmds_file import python_code_blocks, write_python_processed, check_cmd_names
+from gprMax.input_cmds_multiuse import process_multicmds
+from gprMax.input_cmds_singleuse import process_singlecmds
+from gprMax.materials import Material
+from gprMax.pml_call_updates import update_pml_electric, update_pml_magnetic
+from gprMax.pml import build_pml, calculate_initial_pml_params
+from gprMax.utilities import update_progress, logo, human_size
+from gprMax.yee_cell_build import build_ex_component, build_ey_component, build_ez_component, build_hx_component, build_hy_component, build_hz_component
 
 
 def main():
diff --git a/gprMax/grid.py b/gprMax/grid.py
index 536e61d9..385b848f 100644
--- a/gprMax/grid.py
+++ b/gprMax/grid.py
@@ -18,8 +18,8 @@
 
 import numpy as np
 
-from .constants import floattype, complextype
-from .materials import Material
+from gprMax.constants import floattype, complextype
+from gprMax.materials import Material
 
 
 class FDTDGrid():
diff --git a/gprMax/input_cmds_file.py b/gprMax/input_cmds_file.py
index c40c251b..bc6d1de2 100644
--- a/gprMax/input_cmds_file.py
+++ b/gprMax/input_cmds_file.py
@@ -18,9 +18,9 @@
 
 import sys, os
 
-from .constants import c, e0, m0, z0
-from .exceptions import CmdInputError
-from .utilities import ListStream
+from gprMax.constants import c, e0, m0, z0
+from gprMax.exceptions import CmdInputError
+from gprMax.utilities import ListStream
 
 
 def python_code_blocks(inputfile, modelrun, numbermodelruns, inputdirectory):
diff --git a/gprMax/input_cmds_geometry.py b/gprMax/input_cmds_geometry.py
index a536b4a0..cf4c65f8 100644
--- a/gprMax/input_cmds_geometry.py
+++ b/gprMax/input_cmds_geometry.py
@@ -19,12 +19,12 @@
 import sys
 import numpy as np
 
-from .constants import floattype
-from .exceptions import CmdInputError
-from .fractals import FractalSurface, FractalVolume, Grass
-from .geometry_primitives import build_edge_x, build_edge_y, build_edge_z, build_face_yz, build_face_xz, build_face_xy, build_triangle, build_voxel, build_box, build_cylinder, build_cylindrical_sector, build_sphere
-from .materials import Material
-from .utilities import rvalue
+from gprMax.constants import floattype
+from gprMax.exceptions import CmdInputError
+from gprMax.fractals import FractalSurface, FractalVolume, Grass
+from gprMax.geometry_primitives import build_edge_x, build_edge_y, build_edge_z, build_face_yz, build_face_xz, build_face_xy, build_triangle, build_voxel, build_box, build_cylinder, build_cylindrical_sector, build_sphere
+from gprMax.materials import Material
+from gprMax.utilities import rvalue
 
 
 def process_geometrycmds(geometry, G):
diff --git a/gprMax/input_cmds_multiuse.py b/gprMax/input_cmds_multiuse.py
index 8e19425b..dd827dad 100644
--- a/gprMax/input_cmds_multiuse.py
+++ b/gprMax/input_cmds_multiuse.py
@@ -16,15 +16,15 @@
 # You should have received a copy of the GNU General Public License
 # along with gprMax.  If not, see <http://www.gnu.org/licenses/>.
 
-from .exceptions import CmdInputError
-from .geometry_views import GeometryView
-from .materials import Material, PeplinskiSoil
-from .pml import CFS
-from .receivers import Rx
-from .snapshots import Snapshot
-from .sources import VoltageSource, HertzianDipole, MagneticDipole
-from .utilities import rvalue
-from .waveforms import Waveform
+from gprMax.exceptions import CmdInputError
+from gprMax.geometry_views import GeometryView
+from gprMax.materials import Material, PeplinskiSoil
+from gprMax.pml import CFS
+from gprMax.receivers import Rx
+from gprMax.snapshots import Snapshot
+from gprMax.sources import VoltageSource, HertzianDipole, MagneticDipole
+from gprMax.utilities import rvalue
+from gprMax.waveforms import Waveform
 
 
 def process_multicmds(multicmds, G):
diff --git a/gprMax/input_cmds_singleuse.py b/gprMax/input_cmds_singleuse.py
index f26b1d7c..7d7793f4 100644
--- a/gprMax/input_cmds_singleuse.py
+++ b/gprMax/input_cmds_singleuse.py
@@ -20,11 +20,11 @@ import os, sys
 import numpy as np
 from psutil import virtual_memory
 
-from .constants import c, floattype
-from .exceptions import CmdInputError
-from .pml import PML, CFS
-from .utilities import rvalue, human_size
-from .waveforms import Waveform
+from gprMax.constants import c, floattype
+from gprMax.exceptions import CmdInputError
+from gprMax.pml import PML, CFS
+from gprMax.utilities import rvalue, human_size
+from gprMax.waveforms import Waveform
 
 
 def process_singlecmds(singlecmds, multicmds, G):
diff --git a/gprMax/materials.py b/gprMax/materials.py
index 72408563..27bec31c 100644
--- a/gprMax/materials.py
+++ b/gprMax/materials.py
@@ -18,7 +18,7 @@
 
 import numpy as np
 
-from .constants import e0, m0, floattype, complextype
+from gprMax.constants import e0, m0, floattype, complextype
 
 
 class Material():
diff --git a/gprMax/pml.py b/gprMax/pml.py
index d48139d6..f7e36d26 100644
--- a/gprMax/pml.py
+++ b/gprMax/pml.py
@@ -18,7 +18,7 @@
 
 import numpy as np
 
-from .constants import e0, z0, floattype
+from gprMax.constants import e0, z0, floattype
 
 
 class CFS():
diff --git a/gprMax/pml_1order_update.pyx b/gprMax/pml_1order_update.pyx
index aa964007..9751a8b7 100644
--- a/gprMax/pml_1order_update.pyx
+++ b/gprMax/pml_1order_update.pyx
@@ -19,7 +19,7 @@
 import numpy as np
 cimport numpy as np
 from cython.parallel import prange
-from .constants cimport floattype_t, complextype_t
+from gprMax.constants cimport floattype_t, complextype_t
 
 
 #############################################
diff --git a/gprMax/pml_2order_update.pyx b/gprMax/pml_2order_update.pyx
index c3af155a..03985394 100644
--- a/gprMax/pml_2order_update.pyx
+++ b/gprMax/pml_2order_update.pyx
@@ -19,7 +19,7 @@
 import numpy as np
 cimport numpy as np
 from cython.parallel import prange
-from .constants cimport floattype_t, complextype_t
+from gprMax.constants cimport floattype_t, complextype_t
 
 
 #############################################
diff --git a/gprMax/pml_call_updates.py b/gprMax/pml_call_updates.py
index 17205bed..0ccdedb8 100644
--- a/gprMax/pml_call_updates.py
+++ b/gprMax/pml_call_updates.py
@@ -16,8 +16,8 @@
 # You should have received a copy of the GNU General Public License
 # along with gprMax.  If not, see <http://www.gnu.org/licenses/>.
 
-from .pml_1order_update import *
-from .pml_2order_update import *
+from gprMax.pml_1order_update import *
+from gprMax.pml_2order_update import *
 
 
 def update_pml_electric(G):
diff --git a/gprMax/snapshots.py b/gprMax/snapshots.py
index 32acde19..f6ead258 100644
--- a/gprMax/snapshots.py
+++ b/gprMax/snapshots.py
@@ -20,8 +20,8 @@ import sys
 import numpy as np
 from struct import pack
 
-from .constants import floattype
-from .utilities import rvalue
+from gprMax.constants import floattype
+from gprMax.utilities import rvalue
 
 
 class Snapshot:
diff --git a/gprMax/sources.py b/gprMax/sources.py
index 6f631f4e..9b53671e 100644
--- a/gprMax/sources.py
+++ b/gprMax/sources.py
@@ -18,7 +18,7 @@
 
 import numpy as np
 
-from .utilities import rvalue
+from gprMax.utilities import rvalue
 
 
 class VoltageSource:
diff --git a/gprMax/waveforms.py b/gprMax/waveforms.py
index e17613aa..bf2f6ced 100644
--- a/gprMax/waveforms.py
+++ b/gprMax/waveforms.py
@@ -18,7 +18,7 @@
 
 import numpy as np
 
-from .utilities import rvalue
+from gprMax.utilities import rvalue
 
 
 class Waveform:
diff --git a/gprMax/yee_cell_build.pyx b/gprMax/yee_cell_build.pyx
index f71a1d6c..ed2f7969 100644
--- a/gprMax/yee_cell_build.pyx
+++ b/gprMax/yee_cell_build.pyx
@@ -18,8 +18,8 @@
 
 import numpy as np
 cimport numpy as np
-from .materials import Material
-from .yee_cell_setget_rigid cimport get_rigid_Ex, get_rigid_Ey, get_rigid_Ez, get_rigid_Hx, get_rigid_Hy, get_rigid_Hz
+from gprMax.materials import Material
+from gprMax.yee_cell_setget_rigid cimport get_rigid_Ex, get_rigid_Ey, get_rigid_Ez, get_rigid_Hx, get_rigid_Hy, get_rigid_Hz
 
 
 cpdef build_ex_component(np.uint32_t[:, :, :] solid, np.int8_t[:, :, :, :] rigidE, np.uint32_t[:, :, :, :] ID, G):