I've been trying to unlock a mapset using method 3.b mentioned in the guide on this forum. Upon installing the map, mapsource 6.15.11 got installed as well. I ran Map Reverse Converter and successfully reverted my map. I then uninstalled old mapsource + map and installed 6.13.7, to attempt see my converted map, but when I open the old mapsource I keep getting "There is a problem with the MapSource installation. Please re-install MapSource and start it again."

Am I doing something wrong?