Cesium for unity with windows 7

Hi @jkldsajkdlsa, welcome to the community!

Please see my answer here to a similar question regarding Cesium for Unreal:

We’ve never supported Windows 7 in any version of Cesium for Unity or Cesium for Unreal, as this OS was out of support before the very first release of either.

If you don’t need any graphics capabilities, you may want to take a look at Cesium Native, which is the low-level library underlying both products: