Hey guys i have HTC One M7 and everytime i try to install an application outside playstore it just stuck on permission and i can only choose cancel and not install but from playstore i don't have this problem what do you think the problem might be, and is there a fix ?

Check that have you checked the third party installation option in the settings, you will find it.

I had a similar problem .. turned out it was a bluelight filter app I installed it did something funny to the screen that left it with what appeared to be dead spots one of which just happened to be the Install option on my package installer all very weird when I zapped the filter app everything went back to (what passes for) normal