Hey there stacylynj,

Download Mac OS X Yosemite 10.10.3 DMG for Mac full version. It is the best application for the reliability and security of your system. Many other websites are postulating to provide the facility of downloading free software but their link usually does not work. Download Apple Mac OS X Yosemite for Mac to apple's desktop operating system for Mac computers. Advanced SystemCare Free. The upgrade is free, so it's not a big gamble.

OS X security measures. Aware of the problem, Apple eventually replaced the classic Mac operating system with the new Mac OS X, which came with built-in malware security measures. For instance: Quarantine, introduced in 2007, alerts users if they try to open applications downloaded from the Internet. It acts as a reminder, in effect prompting.
Download and Install Malwarebytes. Download the latest version of Malwarebytes for Mac. Locate the downloaded file Malwarebytes-Mac-4.x.y.zzz.pkg. 4.x.y.zzz represents the version number. In most cases, downloaded files are saved in the Downloads folder. Double-click the file Malwarebytes-Mac-4.x.y.zzz.pkg to start the setup wizard.

Thanks for reaching out to Apple Support Communities. I understand you’re having issues installing Malwarebytes on your Mac running macOS Catalina. I’ll be happy to help.