I can’t open the backup catalog file

I can’t open the backup catalog file, it says to me that it is in the wrong format. If I don’t open it, I’ll lose all my work in 2 or 3 months, which is unacceptable. I saved all catalog backups to a separate hard drive and not one opens now. in the last successful session, the program crashed and I had to close it and now the catalog does not open. In the last month, the program began to work more slowly, I don’t understand why I pay money ?? This is not a decent quality