Diesel Stuff Installer Not Working

Just bounces on the dock, any ideas?

I've tried to put it in a .dmg and the same happens.

yeah I've already tried that, stated in the OP

hi ^^ I'm also a mac user & dl'd diesel stuff & it's working perfectly.
maybe if I tell you the way I did it it might work for you? I do mine a little differently in disk utility.

first of all. dl diesel stuff of course
unpack the zipped file with stuffit expander
it should unpack it into a folder
then go to disk utility
go file>new>disk image from folder
then select the folder you just unzipped with stuffit.
then try the .dmg file!

if it doesn't work.. I'm out lol. but this method worked for me so..