So, I've removed and reinstalled the entire A318/9/20/21 family from my computer, rebooted, deleted all the remaining folders, rebooted again, then reinstalled the version 18.104.22.168 from the shop. When I run the updater it says regular and experimental updates are available. When I untick 'experimental updates' from the updater configuration, then run the program again it says 'no updates are available', despite the fact it should show 22.214.171.124 and 126.96.36.199 which are non-experimental updates.
Any ideas? Any help is much appreciated!