Inside the archive you can find save-files with all routes unlocked (i guess) + Full Gallery. Author – Nonsense_Bearer101 (F95Zone).
Tenants of the Dead

SaveGame Description

Installation
1. Download archive (Last Update: 3.04.25).
2. Extract files using 7-Zip (WinRar) ulillity program.
3. Backup your saves.
4. Copy the data from the archive to the save folder! *
5. Run Tenants of the Dead!* The paths may change depending on the version of the Operating system.

Download Save

Save Editor
Bad News! There is no save-editor (or information about it) found for this game! Sorry!
where is the game’s save folder located? .,.
Try this one:
AppData/LocalLow/NTRMAN/tenents/data/save