You can normally access old versions by right-clicking the game in Steam > Properties > Betas . However, the earliest version typically available here is Legacy Portals:
Conclusion Alpha 1.1 represents an early development snapshot of 7 Days to Die with core survival mechanics and many bugs. Downloading should be done only via legitimate, trusted sources; otherwise, users face legal and security risks. For preservation or research, prefer verified community archives and take safety precautions when running old binaries. 7 days to die alpha 1.1 download