There’s a gigantic amount of work for a single person to make Elive
64 versions has been in the TODO list for longtime, the good news is that I have worked for months in making the internal building tools and every related thing to the multi-arch topic to work and being compatible, so the hardest part for make Elive in 64 bit is already done!
I tried then to start porting all the 2500+ Elive packages to 64 bit, but soon I found that this step required a ton of new work and also to upgrade the full system to newer debian base, which leaded to the decision to just release 3.0 and move fast to the next development stage
More details about this in Why Elive 3.0 has old software & drivers
In the meantime, if you need to run 64bit software in Elive 3.0, you can try to use this