SM22: I used Safari before & hated it, so I use Firefox; don't know if that will make a difference, but I'll try to help you.
Go to vod.sizefetishzone.com and click 'Login.' After that, there should be a 'My Videos' button in the red bar along the top. If you click that, it should take you to a page listing this video and under it will be a box that has "Purchased on:" and "Billing Type:" listed, and "Billing Type" should say "Own it." If that's the case, there's a link below that says "Download." Click that, and it should either (A) ask you if you want to save the file or (B) open a new tab/window that displays the actual video. If (A) you should be all set; if (B), simply wait for the entire video to load/play, then just File > Save As... and that should take care of it. On my computer it was (B) and I currently have the file sitting on my hard drive, where I can play it any time I want, just like the ones from the old store.
Note that if this doesn't work there's a link to "Having trouble downloading the file", and you can email
Support@SizeFetishZone.com if it STILL isn't working.