I'm not familiar with that brand, but if it is like other films which use double-sided tape, then I don't think you want it on the plaster anyway--I have had remarkably little luck getting the tape to stick to my wood trim, let alone anything else except itself.

What I would suggest is making a frame to fit inside the window, and use the film from the kit on that, then insert the interior storm into the opening.

The link below says to use ripped-down 1x4s, but I don't see why you can't use 1x2s, which are readily available...just adjust the length of the shorter pieces accordingly.

Here is a link that might be useful: DIY Interior Storms

Could you post a photo of one of the windows? What are the window frames made of - metal, wood, vinyl? It's hard to imagine having plaster walls and no window framing.

If there are drapery rods above your windows, it might be easier to buy inexpensive thermal drapes.