Much appreciated! So if we purchase it now (and aren’t planning on getting a physical copy), will we get an email update of the download link for the new PDF version or something? If so, would you advise buying through itch.io or DTRPG?
Itch will send you an update when the game updates (depending on your settings) and you'll be able to redownload it. I expect DTRPG to do the same, but I hear Itch gives creators more money from the sales
Stepnix was correct on all counts. You'll get the updated PDF for free, you just need to come back to itch or DTRPG to download the update when it comes out. And I do get a bigger cut from itch.io, so if you do not intend to purchase a physical copy, it is better to get your digital copy here.