Can't open file

After you downloaded an apk file, depending on how you start your file, you might get an error "Can't open file".

This error can show up if you are opening the files directly from the top notification bar or if you go to "Downloads" application and open from there.

Try opening a different file manager and browse to the location where you saved the apk file, usually "/storage/download" or "sdcard/download" and open from there, it should work.