No, it should be OK to have different Construct versions installed - I have the last few builds installed so I can check bugs out over builds. MSDN says error code 14001 means:
[quote:1n5dmges]The application has failed to start because its side-by-side configuration is incorrect. Please see the application event log for more detail.
...which is odd. Are you on Vista? Does anyone else get this problem? Can you check the application event log like it says and see if anything useful is in there?
Um... how do I check the application event log?
And no Vista here, I'm on XP, SP2.