Paid subscription conditional within template

[kafi]

I mean overkill because I only need access only one page for subscribed members for downloading one document.
I do not want to use any of these conditional within forum. Therefore all settings for usergroup would be overkill and if I set up about 30-40 subscription I will have to set-up 30-40 usergroups which is overkill for administration....
So basically I need to subscribe users only to this one page and avoid hassles with usergroup settings for entire forum. But I will need subscription conditional that can be implemented for that download page...

Many thanks!