Actually my blueprints were not deleted, I found that they were put in “Saved” folders.
So I meticulously restored them back to their original folders in “Content” and removed the _Auto# suffix they had.
Now opening some of them work, but others cause a crash saying: “epic games unreal engine corrupt data found please verify your installation”.
So I’ll try your suggestion tomorrow, I’ll download and build the latest
preUE5 source version and try to open them there and we’ll see what happens.
Thanks.