What safe anti virus software can you download for your Mac?

Because of its built-in security design, macOS is not vulnerable to Windows viruses and other infections that makers of anti-virus software would like you to believe justify their products.

Do not install any of these products, because there are years of posts here where problems were traced to anti-virus software interfering with applications, and the operating system. When the A/V software was thoroughly uninstalled, the reported problems also disappeared.

The best antivirus, cleaning app, and overall maintenance app for Mac OS is Mac OS itself. All you need to do with Mac OS to keep it secure and running well is to keep it up-to-date and do periodic (about 1x per week) restarts. Other than that, leave it alone. Adding third party antivirus, cleaning, security and other types of maintenance apps to Mac OS adds no additional level of security. The only thing these apps do is have the opposite affect users want. They make Mac OS slow, unstable, generate odd behavior and make Mac OS appear buggy. 

No such product is required on your Mac. Instead, read the article below.

https://discussions.apple.com/docs/DOC-250001781