Does Cesium for UE support older versions of UE？
For example, 4.22-2.26
If not supported, can it be achieved through source code compilation？
No, we are no longer releasing new versions of Cesium for Unreal for UE 4 versions.
We used to develop for 4.26 and 4.27, so if you want, you can check out the Github releases page and download binaries for older versions of Cesium for Unreal. Our last release for 4.27 was Cesium for Unreal v1.24.0.
If you want to build from source for UE4, you can still checkout the ue4-main branch and build from there. If you want any updates from newer versions, though, you’d have to try and integrate those into the UE4 code yourself.