Package parsing error

[curtqn02]

I have a sumsung s5 running Android 6.0
I can install app from Google play store..But when I download an app and install it using file explorer I always get "package parsing error" even I already enable "allow unknown resource "
Anyone has the solution for this?

 

[ironass]

https://www.youtube.com/watch?v=_oPsC4Q_94c

 

[curtqn02]

Thanks for the youtube video