[q] cm 10.2 -> cm11 topic

Hey guys,

I was wondering if I could go from CM 10.2 to CM11 while keeping the same apps that I have? I paid for some apps like wolfram alpha among other things and I'd like to be able to keep it.
http://forum.xda-developers.com/show....php?t=2562988


Also, I noticed that there are GAPPS for 4.4, 4.4.1, and 4.4.2.
Which one would be appropriate for CM 11?
http://goo.im/devs/BaNkS/GApps


Finally, on 10.2, I've been getting an issue saying "Unfortunately, the process com.android.phone has stopped" anytime I enable the sprint tower and disable airplane mode. I've been using this phone as my portable tablet, and I have not activated it but I'm planning on joining Ringplus in the future. Anyone know why?

Edit: Some apps require you to have your sprint tower connected, like Madden 25. Also, I was trying to update my PRL for ringplus, but it looks like I need to flash my phone back to stock huh?
Thanks.