update and than no file found

I used an old version (I don’t know wich one, but very old) of download manager, but today I uptaded it to the latest version (2.9.42), and nothing works. The main problem, that if I click on download–all files it says no file found… but files can be found manually in the folder wp-content/uploads/download-manager-files.

The second problem will be I think, that old shortcodes will not work.

Please help! I don’t know what to do.

Thanks