Cant change from 2head version to 1head

Hello I assembled my new vertex k8400 and i followed the instructions to change to version from double head to single head since i got a single head and the factory version is double head.
So i followed the instructions as said in the site download the version i needed done everything as said and i get stuck in last step cause arduino says low memory avaliable.
PLEASE HELP.

Did you use the 1.0.6 version of Arduino?

Yes i did. I tried the 1.0.6 version and also tried the latest version of arduino 1.6.6
Please some help