So, I got PICO-8, didn't see the $5 more to get Voxatron as well. I don't see a way to upgrade my account to get Voxatron for $5 more. Is there an area that I can do that and can someone point me in that direction? If there isn't is there a way I can take part in this deal still?

I believe it works the other way around? Buy Voxatron and get Pico for free? I would guess that you might need to talk to Zep to work it out at this point.

It's basically a process of changing a P8 purchase to a Vox purchase (since that includes P8); but maybe a Vox "add-on" to PICO could simplify this process?

That would be an ideal solution, but I don't think it's gonna matter pretty soon as Alpha 0.4 is looking like it might ship soon and the deal might end.

(Edit: I've decided to support Zep and Lexaloffle by buying the game again via Humble Indy Bundle. It seems like the right thing to do as I think the work he is doing is pretty awesome.)

Posting in old thread just in case new people land here: this is possible https://www.lexaloffle.com/purchase.php?product=add_voxatron