If you are designing the model in LLBLGen Designer, you just need to move the .llblgenproj file to the new pc. Note that you need to install LLBLGen Designer in the new computer and have a valid license there.
If you are just using the generated code produced by LLBLGen Designer, then you just need to copy such code, and make sure to have the correct assembly references to the LLBLGen ORM support classes in the new computer. Now yo can do this with nuget (ref...).