Driver unavailable

Hello everyone,

I’m French, sorry for my english.

I have a Steinberg UR22, but it does not work anymore. When I go on a recording software, it does not display.

The last time I used it was with another computer than mine, a Mac. On my current computer (Windows) it says that the driver is unavailable. I can not reinstall it. And I can not find the box with the CD…
Can you help me please?

Thank you in advance for your answers.
Rodolphe Crublé