Installations and upgrades may cause IIS settings to be changed in 64-Bit installations.

Following an installation or an upgrade if the application fails to start, please check the IIS Setting "Allow 32-Bit Applications".   In 64-bit installations this value should be False.

To do this:

  • Go to IIS
  • Enterprise Tester Application Pool 
  • Advanced settings
  • General section 
  • Check Allow 32-Bit Applications