As claris/filemaker does its best to hide these links, here is a direct, non authenticated URL to download Filemaker Server 19/20 directly from Filemaker. Beware, their servers are slow.
- https://downloads.claris.com/esd/fms_19.5.1.43_Ubuntu18.zip
- https://downloads.claris.com/esd/fms_19.5.2.201_Ubuntu20.zip
https://downloads.claris.com/esd/fms_20.1.2.207_Ubuntu20_amd64.zip (amd64, Ubuntu 20)
https://downloads.claris.com/esd/fms_20.1.2.207_Ubuntu22_amd64.zip (amd64, Ubuntu 22)
https://downloads.claris.com/esd/fms_20.1.2.207_Ubuntu22_arm64.zip (arm64, Ubuntu 22)