Try removing all versions of Studio from your computer and using regdelete after.
Download the REGDELETE program, click on the link below for the REGDELETE program, after downloading run the REGDELETE program and choose STUDIO 10 on the product, try it about two times, then restart.
Then, Run the REGDELETE program again and instead of choosing all product choose the USER REGISTRATION and ACTIVATION DATA.
You dowload Regdelete here.
Then reinstall StudioPlusTE10[1].6.0.3835 now.exe in safe mode.