How to install update on SD card?

I have lifetime map updates for my Nüvi 2559, but now the update is larger than what the available memory. So I got my self a 32GB SD card that I inserted in my Nüvi 2559. When attempting the update Garmin express complains that something is wrong, under tools and utilities I can see there is only 1,5GB available space on teh unit, but I have 30 GB of free space on the SD card.
But how do I get Garmin Express to use the SD card?
I've seen some video that that you are supposed to get some question during the updates process, but I just have to agree to terms and conditions and then install.

0 JohnfromPA 1 day ago

Make sure the card is formatted as FAT32.

0 Peobody 1 day ago in reply to JohnfromPA

Yup! It is likely that a newly purchased 32GB card came preformatted with an exFAT file system. Garmin requires SD cards to be formatted with a FAT32 file system.

0 JaVaWa 1 day ago in reply to Peobody

32 GB SD cards (and smaller) are usually formatted with FAT32, larger cards are formatted with exFAT.

For the device itself the correct format of the SD is very important, for Garmin Express it doesn't really matter. It will update devices or SD cards with an incompatible format without problems (the device cannot read them though).

Express has a history with several device models where it refused to put the maps on the SD card. A possible solution is to install the map on your PC only and after that installing the map on your SD with Garmin MapInstall.

0 JohnfromPA 14 hours ago

A new version of Garmin Express, 7.25.0.0 is available. With your device disconnected do the update. Then, memory card out of the device, do a format (FAT32). Connect the device without the memory card, attempt the update and insert the card when prompted.