Superb 3 Columbus firmware and Nav update

Hi All

Newb here, so apologies if this is in the incorrect place and thanks in advance for any help

I have a 2017 Superb 3 with the Columbus Mib2 infotainment system that has never had any updates to firmware and navigation since 2017. I've downloaded the latest Nav update from the Skoda update website. I've tried everything regarding SD card formatting, I've checked the update is correctly downloaded ( approx. 4GB ) and I have taken the files out of the MIB2 folder and copied into the root of a freshly formatted SD card but the update is not recognised when the SD card is put into the card holder in the car.

Someone suggested that it maybe something to do with an update license expiring. Would anyone have any suggestions to resolve please?

TIA :-)