using reputable antivirus software like Malwarebytes or Windows Defender. Delete the downloaded file and do not attempt to open it.

immediately if you suspect a virus.

If you have already downloaded or executed any files from a "crack" or "torrent" site for Calibre:

Version 5.44.0 is an older release from 2022. The developers frequently update the software to fix bugs and improve performance. You should always download the latest version from the official download page to ensure compatibility and security. Security Warning