Update:   I think I had the wrong commit for flatpak originally, which is why it didnt seem to work... This one seems to work so far: sudo flatpak update --commit=23651e2468be2d470ab01600ef5ae2e3314062c39d9faf0febcfff7d4c18fec0 com.play0ad.zeroad but perhaps I should go back even further to this commit: 8323bdb2df460d5b97781f728bf70ba4eb7240af as it seems to correlate well with when the 0.26 version was released https://github.com/flathub/com.play0ad.zeroad/commits/master/?after=1108f36d9d0e2b174a31009f68e102aebe7542e9+34  

I have two windows computers and a linux machine (Ubuntu).  One of the windows laptops has an old graphics chip and so version 0.27 is unplayable on that machine.  I want to be able to play 0ad in multiplayer with my family across all three computers, so I quickly and easily downgraded from 0.27 to 0.26 on the two windows machines.  0ad now works great for multiplayer on those two machines.  Just one more to go! However, the versions on all 3 computers must match and downgrading doesn't seem to be so easy on my Ubuntu machine.  I downloaded/unpacked these files: 0ad-0.0.26-alpha-unix-build.tar.xz, 0ad-0.0.26-alpha-unix-data.tar.xz but the instructions for building from these files are a mile long.  Is there a way to get a package type installation for 0.26 on Ubuntu?  I also tried flatpak, but that didn't work well.   Thanks in advance!  

https://mod.io/g/0ad/m/10ad You can conveniently get this from mod downloader.

Nice, thanks for the context! 

Your horse doesn't fit in a tower. In the cc or fort it's ok. Except when the game setting is regicide and hero garrison is off, then also no additional arrows. Maybe just change the tooltip to "it's complicated".

Agree. Don't believe the AI. Hence my post.