OK; so here is where we at. I did reproduce your error. I have no reason to believe that the 3.4 release caused this problem.
I was in fact able to recover it using the procedure outlined here: Corrupt or Otherwise Broken Audacity Project Recovery and the project loads fine on 3.3.3:
as I no longer repair projects for other people, you are just going to have to to this yourself. What error did you get?
I also tried to load it with 3.4.1, and received this message:
Let me suggest that you continue your edit in 3.3.3 and once you have finalized your project, upgrade to 3.4.2 or later, when it is perhaps just a wee bit more stable. You can download 3.3.3 here: Old Audacity versions download
I also noticed that your project was extremely bloated. I was able to reduce the size of your project from just under 4GB to just under 1GB by following these steps:
- Ctrl+A (Select All)
- Ctrl+C (Copy)
- Ctrl+N (New)
- Ctrl+V (Paste) and do NOT paste Smart Clips!
Good luck!