Why wont it let me download my 4 apk files?

[Android Central Question]

Recently I have downloaded 5 APK files on my kindle fire to get Google play but when I want to install them it won't let me press install. Nothing pops up like the cancel button will let me press it but not the install button it won't do anything what shall I do?

 

[firebirder]

Did you ensure the option to install from unknown sources is checked? Should be under the settings menu...

 

[Rukbat]

Press the apk file itself (in a file manager - after you ticked the box firebirder told you to). If anything pops up, it will be to ask you which installer you want to use (if you have more than one way of installing apps). Chose the one that looks like the default one. If nothing pops up, it should get installed.