I can`t correctly build my project

When I try to build my project, I get an older version of it, all the changes are saved but, cant be buld… can someone help me?

I mean, I made someth, built ver.1, then i changed something and made ver.1.5, tryed to build but i get ver.1 again, why???

Usually this means the build failed, and it simply didn’t overwrite the files/data from the previous build. The most common cause for this, at least for me, is a compiler error that only occurs in a build, but not in the editor. For example, trying to use code from the UnityEditor namespace in the build.

Anyway, the best bet would be to look at the editor log to fine errors. Search for “error” or “fail”, and hopefully you’ll see the error.