Recovering a temporary project


yesterday I made a recording in Audacity 2.4.2, the project was not saved yet.
For some reason my computer restarted itself.
I restarted Audacity, I did not get the usual dialogue that asks me to recover my project.
When I then closed it, it had the dialogue pop up to remove temporary files, and yeah, apparently it deleted all of the project I had.

With a recovery tool I could restore all the files of the temporary project, which seems to be complete.
A decent amount of gigabytes of .au files, ranging with a modified time pretty much from the start of the recording to the end of it.

It seems like I should be able to restore this somehow, but the dialogue for restoration just never shows up, and audacity removes the files on closing each time.

How can I restore this, and save it properly?

The short answer is you can’t. This is one of the reasons for the 3.0.0 “unitary” Audacity project eliminating all of the little files and instead integrating everything into one single “database” file.

Some people have had success in sorting these 6-second .au files by date and then somehow assembling the original recording from that. It is not easy - which is probably why no one has replied to your query.

Note that 3.x.x projects are not immune from damage. Fortunately there is a tool that can recover most/many 3.x.x projects that have been corrupted. It does not work on 2.4.2 and prior projects.