Draftsight Crashing on rotate, won't fully uninstall. Now won't install Please help

After renewing my licence i updated the software that had previously been working fine. When using it to rotate, stretch or mirror etc. It crashed every tome. I tried to uninstall it however its not fully uninstalled on the registry, and now has a corrupt registry. I've tried to reinstall but get the following "Installation failure due to missing MSI file".

I can't use of edit anything. I can't believe in the first place that an update has been allowed that is this unstable, and that the program is so deeply embedded in the windows eco system it wont fully uninstall.

Any help from you guys is greatly appreciated. I'm really at my witts end.