1) Make sure that hidden folders are shown.
2) Find a folder with backup files, make a copy of all the files and save it elsewhere (Go to Disk C -> Users -> Your username (e.g. Natalia) -> AppData -> Roaming -> Priority Matrix -> Select backup files, copy them and save in a different folder)
3) Import the most recently updated file into the app (Go to your app -> File -> Import PMatrix File -> select the file)
4) Check if it worked and let us know if it didn’t.