final cut pro x trial not installing
Ok so when i first got my laptop i tried downloading final cut pro trial but it would always say "invalid checksum" when verifying. it happened multiple times everytime i always tried to install it, until one day I'm not sure what i did that it finally downloaded. i used it until my trial was over so i bought the full version the begininng gf this month. i tried installing it and it would download all the way until it changes to installing and then it says "download failed try downloading again in the purchases page" this has been happening the day since i bought final cut pro. now its been 3 weeks and still nothing works, i have chatted with technicians online and have taken it to the apple store and they keep saying they don't know why final cut pro isn't installing because the laptop is working fine. so anyway i got my refund on it, but now I'm trying to install the trial but it keeps showing up invalid checksum when it verifies it,so i click skip and it will start writing the files but then in the middle it will stop and say " failed to download....contact the developer". honestly i don't know what to do anymore i need this app to do school work and I'm really frustrated that nothing seems to be working. any suggestions would be greatly appreciated! thanks.
MacBook Pro (13-inch Mid 2009), OS X Yosemite (10.10.2)