Supporter plugin activation fails

I am able to upload the supporter plugin successfully. However once I tried to activate it the results page is a blank screen with the following text in it: "plugin has bad header"

Or something like that.

If I go to my plugins page I can see that it's actually installed. However if I try to activate either of the 3 supported plugins available (or all three at once) I get no change in status.

What am I doing wrong?