iTunes won't open after update; MacBook Pro, Mac OSX 10.6.8, iTunes version 11.1.5

i had a problem similar to yours and better yet, i have the fix for it. i downloaded maverick 4 months ago and was without itunes ever since. all itunes icon did was bounce. itunes would never open and whats more, is when i would try to update it, i would get a "thank you for downloading itunes!" page , but the download would never work. so i scoured the net for solves. nothing that worked. <4 months later> then last night i took a new approach. i decided even though maverick would not allow me to uninstall itunes, i would find a way to uninstall itunes. then i would reinstall back to 11.1.5 i was successful and heres what i did.

step one-

Back up your iTunes Library.itl file, found under ~/Music/iTunes

(even tho i didnt, i only had 3 artists in there at the time. and they didnt get erased but i advise you back up just in case.)

step two-

download itunes 10.7 from apple. i used this link Download it from Apple here

(i pulled the link from Aarons website (awesometast.com). you download 10.7 however you want but i used the link above and have had no issues).

although im not sure you need to do this step ( you may be able to download 11.1.5 itunes without 10.7, i did because i was following intructions from http://awesometoast.com/downgrading-to-itunes-10-7-from-itunes-11-on-osx/

)

step 3-

open Terminal

step 4-

enter in these 3 commands hitting return after each line. 1st line nothing seems to happen, 2nd line nothing seems to happen and 3rd line gives you a warning and requires password to continue. when i did it, my password didnt appear as i entered it and i hit return without looking, so i entered it in again, although im not sure i had to the 2nd time.

killall iTunes

killall "iTunes Helper"

sudo rm -rf /Applications/iTunes.app/

step 5-

drag off and dump the itunes icon (which now has the ? shadow in it) off your dock.

step 6-

install 10.7 itunes you downloaded earlier. (not sure if this part is neccesary. you may be able to just download 11.1.5 but i downloaded 10.7 because i was following Aarons steps.) itunes now works.

step 7-

go to apple and update to 11.1.5 itunes. install it. open it and you have itunes 11.1.5 in perfect working order. assuming you have a decent internet speed for the downloads, the whole process takes very little time.

with those steps above, you can solve itunes just bouncing and not launching issues and also the "thank you for downloading" and nothing downloads issue. enjoy. also i would like to give a shout out to http://awesometoast.com and thank Aaron for the knowledge that enabled me to get itunes back into my life.

and instead of doing step 4- you can go ahead and try this instead to uninstall itunes first, i just read about it after my post:

open applications, right click on itunes, goto get info, go to the bottom and change all the permissions to "read and write". then you should be able to uninstall it without entering the 3 line command. for more info on that see what mcblob wrote here https://discussions.apple.com/thread/5503035?answerId=23588143022#23588143022