Please help to recover an "invalid" file

hi, my recovered file is not possible to open - says “invalid file”.
Is there someone who can try to recover it? would be deeply thankful!!!

Have you tried opening the .skb backup file?

Yes!
Says invalid

Vänliga hälsningar / Best regards,

Caroline Rönnberg | CEO

Can you put the file online somewhere, and give me a link to it? If the SKB also shows as invalid (after you have renamed it to .skp and test it that way), then you only need to upload the latest version.