Finding an old version of Git

I have just downloaded the .dmg file for the latest version of Git for my Mac with OS X 10.7.5. When I type:

git --version

I get:

Illegal instruction: 4

This apparently means that my installation contains instructions that my OS doesn't understand.

In order to get around this, I was going to try to download an earlier version of Git.

I've searched but I can't seem to find a .dmg for an older version of Git.

Could someone point me in the right direction please?