It seems like the author for BetterQuarry has abandoned the project, so I decompiled the assembly and have updated/recompiled it for SDV 1.3/SMAPI 2.6. I'm including the source code project for the next time this needs to be updated (hopefully that isn't against the rules).
Note for future updater: Inside the project, I have a folder for game file references which I'm not distributing, so you'll need to copy them there yourself.
Note for future updater: Inside the project, I have a folder for game file references which I'm not distributing, so you'll need to copy them there yourself.