Steam is temporarily unavailable - client registry.blob delete
Usually the error message disappears when the file "client registry.blob" from your hard drive delete:
- Make sure that Steam is completely terminated and not in Offline mode.
- Now you can open the installation directory of the Steam directory (the directory in which the file "Steam.exe" is) in the Windows Explorer. Usually, this is the path "C:\Program Files (x86)\Steam".
- Look for the file "client registry.blob" and delete it. If you get an error message, we can help you in a special article further on.
- Then start Steam again. The previously deleted file is re-created automatically, and Steam should work again with no errors.

Steam is not available
By the way: After a clean install of Steam you need to download is not mandatory for all games. What here to do, you will learn in the next tip.