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. 

To use them, extract the files to /path/to/energyplus/PreProcess/IDFVersionUpdater

If any files are duplicates, you may allow these to overwrite. These files are 64-bit Linux executables.