If you are looking for a "piece" of the game data—like a save file to skip the grind—you can find community-made on the Repentance Speedrun Resources page.
Are you trying to or find a certain item within that version? File: The.Binding.of.Isaac.Repentance.v1.7.9.zi...
: You can now safely open and take items from chests. If you are looking for a "piece" of
: The teleport only triggers once an item pedestal is emptied. File: The.Binding.of.Isaac.Repentance.v1.7.9.zi...
The CRAZIEST One Item Break In Isaac History!!! (Patch 1.7.9)
: Usually found in your Steam user data folder or the game's main directory.
: If your file is corrupted, you can often recover it by renaming your backup files (found in the remote or PersistentGameData folders).