Unless it's a retrofit / fiddled one you can't do it. Maps are available for November 2019 release but I dont publish them since UK people are stuck, no easy DIY solutions. Its an area of retrofiters minting it in.
The Mib1 standard download is this for November 2019 but as said not a lot you can do with it....
you must back up your SD card before deleting it as well as you will get in a pickle - that's happened. Was the holly grail of the thread for a bit and nobody cracked it as yet as a DIY activity.
http://vw-mapscdn.tdd.adacorcdn.com/P89_N60S3MIBS2_EU.7z
If it's a mib1 high then use the mib2 high one which is common across high units. Again that's a retrofit fix for those units to give it that capability.
Only the Mib2 standard with the work around can be updated for Seat's unless you have Mapcare not sold in the UK or done in the one year grace period from purchase where Mapcare is available (dealers cover to sell cars with old maps on them). All other Seat units need to have retrofit work done on them for subsequent DIY map updates.