That's more of an issue with the mib2 high update which will stop in its tracks if it fails a validation signature check. That removes the extraneous characters Mac's put on files over and above PCs.
CleanMydrive should be run on the SD card for Mac's. The only reason that it wouldn't work is if you were using a Mac. Copy across new maps, add the original overall.nds file in the directory overwriting the file in it and it works. Thus if you dont have a Seat card since its lost you can buy any release of a Vag card, whether mib1 or mib2. You just go back to year dot of mib2 and it fixes all issues. That means a universal solution exists for where the overall.nds file is lost. A function of Mapcare is you can also load old maps into the unit before the release that the unit was paired with. To put this right you downloaded the matching release to get the overall.nds file, then it was found the release didnt have to match with the original one, could be any before. Subsequently using the "workaround" method people deleted the data on the card and lost the overall.nds as you did by following the Seat website instructions missing the fine print that Mapcare was not available in the UK (sold). What Exciter found has moving the overall.nds file from the original card to the new map release was that it fooled the system to think the map hadn't been updated, since the period date stamp hasn't changed. Where Mapcare isn't sold the cut off date is set at the release date so if you change the data on the SD card you get that message. That's the cut off period for putting new maps in the car. So when your initial card went in the unit it updated the units navigation FeC (function enablement code). Mapcare which you can't buy in the UK gives you an update period. So when it initially read that file it said June or November, year xxx. The overall.nds file links the map release to your unit. It does not link the card specifically to your unit. It just means that sales income from map cards goes to the VAG group. But given Seat cars are festooned with system error messages these days, who's counting. Juggling that file it thinks that no map update has been made although it records that something funny has happended in VCDS. clever stuff and pin pointed the file in question which holds the release information. Exciter used a method of tracing how the files are used. The other fixes use custom firmware of one sort or another.
It was quaintly called that by board members. Those releases are for countries where Mapcare was sold.
Not the end of the world, easy enough to fix and upgrade to the latest November 2021 maps. You missed the small print on the Seat board that said not available in the UK. but no worries we learnt from other people on the board, we go back to the year dot mib2 overall.nds file, detailed and Bobs your Uncle. You use the "workaround method" which needs the overall.nds file you deleted !.