Armor won't allow you to load it on your computer if Nonton is already on it

I used Armor on my router with Norton on my computers for a year with no problems.  Recently, I decided to load the Armor app on my computer to test drive it.  Armor would not download if Norton was installed.  I had to uninstall Norton to get the Armor app to load on my computer (Windows 10). So far, the Armor app is working well.