The install fails for me and it says 1.5 is not supported. A Google search showed it as a common problem. I'll try the other option.

EDIT: Nope, none of them work. A few people seem to get lucky, but it fails for most people.

EDIT 2: Installing this extension is a little hack that allows installation of incompatible extensions. May be useful in the future. I think it's made for beta testers so they can install and test extensions.