A longer, but easier path is to switch your update stream to the Plus one without the alpha or beta in the name. Then wait for the next regular release.
To me, the retail releases are Trainz 22 and Trainz 22 PE. Plus is a subscription version. Each version has a regular stream, testing beta and testing alpha version. Maybe that is just in my head. Maybe that will help clarify things if they would preface the beta and alpha versions with “testing.”