Hello there. Thank you very much for your responses. Actually, it’s not an old version. I had version 5.4.4 installed, then uninstalled it and reinstalled the same 5.4.4 version.
When I try to open the relevant blueprint using a hex editor or similar, I can see actor names and such, but I can’t access them. So, the file doesn’t seem to be corrupted. It looks like Unreal Editor stored the data before compilation but without assigning a version.
In that case, would it be possible to open the blueprint in an earlier engine version? For example, instead of 5.4.4, maybe 5.0.3 or 5.1?
If I can at least access the blueprint and retrieve its contents there, it would be really helpful for me. Otherwise, a major mechanic integration I’ve built will basically be lost.
Do you think installing an older engine version and trying to open it might work?