They're available on the releases page (there was a link in the part of my post you quoted :)).

If you can provide some more detail about what you were doing before it quits, that would be useful (for instance, does it happen when creating a new inscription on an uninscribed book or does it happen when editing an existing inscription?). If the dialog for Apple's crash reporter comes up after Angband quits, pressing the "Report..." button and then posting here what appears in that report would also help. You don't need to send the report to Apple. The part of the report that's most relevant is the part immediately after "Application Specific Information" so posting the 15 to 20 lines after that is likely enough. That would look something like this:

I'm gonna try to download the latest version and see if I can get it to crash after book inscription and then do the report thing for y'all.

Usually this happens on the town level after inscribing newly bought basic books (I often dump them in the dungeon to make an inventory slot for stuff I wanna drag back up). But I think it also happened before when I was messing with inscribing thrown weapons in the quiver--in that case changing inscriptions from @v2=g to @v3=g for instance.

Anyway what I recall (for now until I can reproduce it) is that after doing the @b1 inscription, when I try to browse the book using the b command (b1), it quit.

So previously I mentioned the nerfing of rods of Magic Mapping for warrior types.

Now I noticed you did it for rods of Curing too.

Not sure why that was changed. They were pretty bad already...

Arkenstone shown in grey?
 

Maybe it's same for all versions and not specific to 4.2.3 but just saw this:
Drank potion of enlightenment and it listed 'an arkenstone'. But it was in grey color at the bottom, as if it was a crap item. Turned out to be perfectly fine arkenstone with no negative effects so no reason to show it as junk... good that I went to check it anyway:D

Unmappable vault
 

I just posted a screenshot of a vault that resists mapping. I guess this is an embedded maze that by design is unmappable (which I like). However, I'd prefer that the outer perimeter was still mapped.

I had a Stonefoot Warrior dropping a Shovel of Earthquakes. Now this is a brand (well not a brand, the real brand there is acid, but you get the idea) I have basically never used for melee. But now, found early, being (+11, +11) <+3> STR, it obviously became my main weapon. Despite the dungeon scrambling, I thought.

My question is: why doesn't earthquake trigger at all? I fought over 20 levels with it and the quake never happened. I'm not saying I like earthquake effect on a weapon, just want to know why is there a gimmick on a weapon that never activates.

Played (and died) on angband.live 4.2.3.

I'm fairly sure you need to go over a certain amount of damage to trigger a quake which is easy enough for Grond but far less so for a mere shovel.

x k -- nothing happens (rogue_like_commands)
 

Using "x" to look around while using rogue_like_commands seems broken for "k" which should move the cursor upwards. All seven remaining directions works as before though.

I assumed something like this. It did around 50-60 acid dmg per turn average, so it was a great find for a half-elf rogue. In hindsight, it was even greater because the quake never did occur.