Read the readme in this category for further description.

Beginning with v8.4.0 Update 1, the EnergyPlus installers include all transition programs from v7.2.0 to current. 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, except do not overwrite v7.2.0 and later. These are 64-bit binaries.