I don't know it, but i think, you need to spent 20 dollar, if you want to upgrade it. my tip is, buy it for 20 dollar, then you have all ;)
I don't think I'm understanding. So I spent $10. I have that version. If in the future I want to upgrade to deluxe, do I go to downloads, click contribute +$10 and get brought up to the $20 tier? Or do I have to spend $20 for that version? meaning I would have paid $30 total for the highest tier. I'm not sure how itch.io works.
i think, you need to pay 20 dollar for getting monstrous, and you paid 10 dollar now? i think, you need to pay anyway 20 dollar that would be 30 dollar, you spent. i've told you to pay 20 dollar instead to get access to all files at once.
If i being honest: i don't test this my self, but i think, that, if i pay 10 dollar, and want something, that is 20 dollar, then i need to pay 20 dollar. i am not sure about this.