@FranceNeedsMorePower
So should have two triplea/Triplea folders

We already talked about the one. The other one is where the Triplea Engine is located. The big T Triplea folder.
I have 14962 and 1530 in mine.

You should have uninstalled only the one map, not all of them. Well, you will have to re DL the old ones unless you can dig it out of trash.
Two ways to uninstall a map. Fire up triplea. Go to DownLoad Maps and hit Installed.

This will list all the maps you have. Click on the one(s) you want to uninstall and hit Remove.

The other way is to open up your downloadedMaps folder, discussed above, and physically delete the map(s)