I've never seen it on DVD though. It was actually a pretty good flick. Don't know why it never made it past VHS.
If you mean Lifeforce, it is available on DVD - see Amazon
You can see a lot more of Mathilda in the flick Becoming Colette or sometimes titled just Colette.
Sorry, but Biog/Drama is just too real life for my tastes - give me SciFi, Horror or way out Action any time, no matter if it's B-grade or even Z-grade.
If I want something close to real life I can always turn the computer off
Don't try to work out the intricate plot-line of the vampire' origins as there's so much detail it'll make your head hurt.
In that respect it's pretty much ahead of almost all the recent movies which leave you scratching your head and going, "Wait, now just where did those guys come from and what the hell have they got to do with this?"