Hey! Yes, you can indeed get the digital files. The best way is to go through your FLGS for those. Sharkbomb Studios is part of the BITS AND MORTAR program (https://bits-and-mortar.com/publisher/sharkbomb-studios) which is a way for you to get the digital files with your physical purchase. However that requires your FLGS to also be a partner in the program. I generally recommend that way because it signals to FLGS's that it's a useful program they should make a better job highlighting.
However if they're not a part of the program (or getting back there is no possible, because you bought it while traveling or something) you can send a proof of purchase to me. You can either do so by reaching out via Discord (https://discord.sharkbombs.com) or by going to the Sharkbomb Studios website (https://www.sharkbombs.com) and using the contact form there.