It makes your computer as a whole less secure because new security issues will not be patched.
Tor Browser will work the same as it always did but it won't change that fact that your machine is more vulnerable.
Tor Expert Bundle on Windows
Tor for Mac
It comes as a standard part of most Linux distributions.
These are not like Android apps. If you don't want to learn how to use a command line, then they aren't for you. If you want to take the time to learn something new, this will do it.