[DeMagH]

Pretty easy to install:

To install, upload remindermail.php to your ./includes/cron/ dir, and import the product xml
Options are in admincp options menu, where you should edit the settings.

that's what is mentioned in the text file i downloaded with the hack, doesn't seem as complicated as the marks above indicated. Just a simple one file upload and no template changes done by users at all, should clarify this in the first post.

just an advice for ppl out there, i was doing this manually for inactive users and i got some responses in new threads stating that "we trusted your website with our email addresses, you shouldn't be threatening us with your emails and some other users reported it as spam "which will cause huge forums to collapse ASAP as most hosting service providers don't allow spam, so they may stop your hosting plans for the violation of one of their policies" i myself got a warning before i stopped sending emails to inactive users"

Requesting a feature in this hack:
-To have a link within the email msg stating if you don't want to receive this email again please "click here", to unsubscribe the user from such mailing list if he desires, will protect us all from being reported as spammers.
-To have the ability to allow/disallow forum users from setting pre-reminder time.

Finally:
thanks for the hack, pretty good idea to have this managed automatically.