Beloch of Papers and Pencils (one of the original playtesters) very kindly walked me through a number of ambiguous wordings and suggested some minor rules changes for Into the Depths. I'm grateful for his keen eye, and have incorporated most of them in. As a result, eight days after my first major update to the rule system in two years, here is the new version of Into the Depths incorporating Beloch's suggestions and a few minor changes I decided on after hitting publish last time.
Most of the changes are very minor. You'll notice slightly clearer wording in the grappling section, the sections where carrying capacity is explained (backpacks now let you carry 8 + / - Armour Mod. items, with special Frame Packs adding +3 to that capacity), auction catalogues let you assess the value of things slightly more easily, and some minor formatting, punctuation and phrasing changes in a few tables and other sections. I also removed a rules loophole Beloch spotted, where you could spend a day creating a new spell and suddenly gain half a level repeatedly. That's been changed so that creating spells no longer qualifies, only creating magical artifacts does.
If you're not sure what version of Into the Depths you have, I've been date-coding them for a while, so this update is 20180509, versus the version without errata, which is 20180501.