All I did was uninstall every version of Electrum, shut my macbook down, restarted it and then downloaded the newest version of Electrum again and - POW! I was able to access my wallet again...? ???
Probably caused by installing the update while an instance of the old version was still running.
If not actively running, a "
zombie" electrum process was still running in the backgound.
Because that'll prevent some files to be overwritten by the update.