Read the readme in this category for further description.

Beginning with v8.4.0 Update 1, the EnergyPlus installers include a limited set of transition programs. This archive contains transition programs from v1.0 to v8.4.0.

Extract the files to /Applications/EnergyPlus-n-n-n/PreProcess/IDFVersionUpdater/

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