Removed link to out-of-date screencasts on installation

README.rst

@@ -74,8 +74,6 @@ The following steps provide guidance on how to install gprMax:
 2. Install a C compiler that supports OpenMP
 3. Build and install gprMax
 
-You can `watch screencasts <http://docs.gprmax.com/en/latest/screencasts.html>`_ that demonstrate the installation and update processes.
-
 1. Install Python, the required Python packages, and get gprMax source
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