GSF

I've previously discussed the same matter with Jeff and he said the same thing, so don't worry - there's an easy way to get this done.
Go to the clickteam forums and create yourself an account. Then, in the profile settings you will find a 'My Product Serial Codes' or something field. Add your serial code to this. If done correctly, you'll get a spiffy MMF2 icon under your name.
Once you do this, you have access to the MMF2 owners subforum, where you can redownload the installer anytime you want.