I understand why you're doing it, but the download link redirecting me to an email capture page is quite jarring. If your download link is at the top of your homepage, and there's more product details below that link, it's pretty typical to hit download and assume it's a normal download link while you read the rest of the page. An easily dismissible modal would work better (or put an email capture in your app on firs…
That said, this completely makes sense, I'm definitely going to look at that. I could fairly easily swap the 'sign up for updates' in directly in place of the download button when that's clicked I think, which would avoid the extra page and the modal all together, make everything much nicer, and still give keen users a clear opportunity to properly follow the project.
Thanks! Great point.