

While it's profoundly frustrating for those of us who like to tinker with the lower-level parts of OS X, it's a very good thing to protect the lower levels of the system. It's also somewhat helpful that El-Capitan uses rootless or System Integrity Protection as well. Those Gatekeeper notifications that pop up before opening an app get a lot more to-the-point when you try to open up an app that matches a pre-defined set of apps in Apple's database. Macs do have a bit of a built-in system with Protect (File Quarantine). So while Windows has all that backwards-compatibility, there are some Apps that worked on Yosemite that I can't use on El Capitan unless the developer updates their app. Macs tend to stay more secure by breaking backwards-compatability all the time. That means that every bug that needs to exist because some backwards compatibility requires it to persist will still be there.

MAC ANTIVIRUS SOFTWARE FOR YOSEMITE WINDOWS 10
A Windows XP program has no problems running on a Windows 10 computer. Windows tends to be extremely different from Macs in terms of back-wards compatibility due to their Enterprise status. Most infections that get reported in cases like are Windows viruses that you could possibly transfer through your email. These tend to be the simplest to execute, and phishing scams tend to be unfortunately extremely successful and more lucrative than anything else in the online scamming world. These would be cases where someone gets your information through something like would be the actual website that you are accessing, and since you can download webpages and re-host them, fake webpages can be used for stealing web logins. In most cases, recent attacks come in the form of phishing schemes and internet-related hacks rather than viruses.
