We found the problem (a bug in the InstallShield program) and have fixed it. This problem was never seen in 6 beta test versions.
Please redownload Microstudio 2.506 from your link in your email.
Anyone seeing this problem should redownload the microstudio2506setup.exe file from your download link in the email you received and then run it to install the fixed version. The current code has the fix in it.