Thank you for the mod, the decent size icons are much appreciated.
Installing was a bit different from the instructions because I use the flatpak version on Linux. I copied the downloaded file to "/home/USERNAME/.var/app/com.play0ad.zeroad/data/0ad/mods/" and then opened it with 0ad from that folder. This has to with permissions, I believe. Something similar may need to be done for anyone using the snap version but I am not familiar with the file structure.