How To Get Torrent Scan For Any Malware Before Downloading A File?

For torrent scant You should check the reputation of the site or the comments of the file. Unless someone is using a day 0 attack or an unpatched vulnerability you will be safe. You can't do anything more before you download the torrent. If you wanna check if the torrent has any kind of malware after the download, you should have a sandbox tool and a VM(Virtual Machine) or a dedicated computer for checking the files you have downloaded. You can use an antivirus, malwarebytes, roguekiller... After that, you can upload the files to virustotal and see if one the antivirus detects something in your files.