For some reasons, I can only use Xcode 15.2. What Tuist version should I use for this?
You should be able to use any Tuist version with older Xcode versions. You can specify compatible Xcode versions like:
import ProjectDescription
let config = Config(
compatibleXcodeVersions: ["3.2.1"]
)
To provide more suggestions, you will need to be more specific in regards to what issues you are actually running into.