Follow the steps bellow:
1) Uninstall WSA.
2) Upgrade .net framework to .NET 4.5.2 version.
2) Run a Clean zip -Download this file from https://www.copy.com/s/thT9HVI7G3Moqywb. Extract it to a folder location of your choice and within cmd prompt cd to this folder and run Cleanup_xtra_man.bat. This will try to remove all remaining traces from WSA from the machine and its registry.
3) Reboot the machine
4) Now install the latest WSA version.
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