[Nachteule]

arm64 tagged images are 64-bit versions, so XBian_2024.02.14_arm64_rpi5.img.gz for example work on Raspberry Pi 3-5 and include the Kodi v21.
The others are 32-bit versions, for example XBian_2024.02.14_rpi5.img.gz, and work on Raspberry Pi 2-5. However, the Kodi v20 contained therein does not run on the Raspberry Pi 5, as I unfortunately found out yesterday.
So soon the rpi5 tagged 32-bit version will also contain Kodi v21 and the rpi4 image will be maintained for a while longer