*.MOD files are modified mpeg2 files
You could either rename them from *.mod to *. mpg or convert tam ( i would simply rename TBH)
*.mod file extension is also used by Panasonic Camcorders so it isnt proprietary to JVC as such
JVC tend to use a cut down customised version of Cyberlink Power Producer and Director in thier bundled package
Many folk tend to upgrade to the full versions
Virtually all modern software support "mod" anyway
As such , you cannot blame them for asking for £25 as it would have been part of your original purchase and you did lose it
I dont imagine you need it to actually download from camcorder
As an aside
VLC should read *.mod files : give it a go