Windows doesn't have an app store either. At least not the usable version (up to Win7).
Almost every time you want to install a program on macOS/OS X, it says to drag n' drop the program to the program folder in the window itself. Super self explainable if you ask me.
When i got my iMac in 2015, i didn't even need to google this. And i didn't either feel disturbed by having the choice between Apples appstore and proggs from the www.
Be me
Angel Walker