Read the readme for further details.

Beginning with v8.4.0 Update 1, the EnergyPlus installers include a limited set of transition programs. This archive contains transition programs from v8.4.0 to v9.0.0.

This set of programs and associated files should be extracted to your \PreProcess\IDFVersionUpdater folder

The exe files are for the Windows 64-bit platform. If any files are duplicates, you may allow these to overwrite.