A major Windows release is kind of a big thing in the desktop world.

Missing 5 Windows releases is just sloppy: Vista, 7, 8/8.1, 10.

I'm not saying it's a bad product, just that first impressions matter. There's a reason this site is full of discussions about conversions and funnels.

As a side note, Windows is also 30+ years old. Hardly new tech these days ;)

> A major Windows release is kind of a big thing in the desktop world.

I can bet that LispWorks' customers (big companies and experienced lisp users) are largely away from the mainstream desktop world, and wouldn't care too much on how the current Windows UI looks like.

Software age is a non-sequitur- there are plenty of active multi-decade projects that can update their marketing material once in ten years. Nobody suggested they do so every year, even though it takes what like an hour? For a product costing $thousands there is not really an excuse.