Alpha & Beta Versions Not Found on Launcher

On my old Windows 10 computer, I had access to the alpha and beta versions of minecraft. Then, I bought a computer with Windows 11 and I only had access until version 1.0. I also lost my worlds I had from Beta version 1.7.3 and Alpha 1.0.16. Then, I tried on a virtual machine with Windows 10 and I didn't have access either. I don't think it's an update, because other people had access.