You must mount /system partition in rw mode. Put "su" and than "mount -o remount,rw /system" into Terminal Emulator.
Or, you can use some file manager which can write to /system partition. I recommend X-Plore File Manager.
No, certainly you are not. That download counter don't refresh every download. I downloaded it yesterday at about 22:00 UTC+1.
And I'm sure I was not first and some people downloaded it earlier than me. ;) But it is not important :D
Hm, I got this when I installed Xposed with GravityBox, but reboot didn't helped and I had to reflash ROM. When I tried it again (Xposed and GravityBox) it was same. So, I'm again back on MoKee :/.
@Paulus123, so, I think, this is the most important difference.
@mischler, hmm, I had this problem month ago but now I don't know how it is. Maybe still not working... Have you tried any headset?