Just updated mine to 2023 yesterday.
I got the files off the MG EU site, entering my VIN number in the process.
First it took about 2 hours to download a failed download on Friday, then about 3 hours to successfully download again yesterday.
It took me about 4 hours to unzip the files directly to a 32Gb memory stick, the files are 23Gb.
Put it in the car, selected update and waited 3 minutes for it to recognise the Map files and 27 minutes to update.
Apart from the first failed download of the files, everything went as planned, it didn't ask for the VN file or anything when updating.