Apparently I found a fix for this issue, It has been working for 2 days without problem. This is what I did:
Having installed 4.10 and 4.12:
Deleted all content on 4.12 folder C:\Program Files (x86)\Epic Games\4.12\Engine\Binaries\DotNET\IOS
Copying the all content from same folder in 4.10 to 4.12
Change the build directory, from project directory to desktop
I still dont know what caused the problem since the iphone packager crashed at first when I was using 4.10, the problem persisted installing 4.12 and now it works with 4.10 packager in 4.12 version
Thank you for your assistant through this proccess