A published jar now beats the mc range somebody typed.
The catalog said ShapeBoard was >=1.21 <1.22 long after it started shipping a 26.2 build, so install refused a jar that exists. When a release explicitly names your server's Minecraft version, that fact wins over the declared range, in install and in doctor alike. This matters as the rest of the mods get ported to 26.2, since they all ship one jar per Minecraft in a single release.
Also: every flag has help text now. The command reference is generated from it, and nine flags were showing up blank.
curl -LO https://github.com/CodeW4VE/w4ve/releases/download/v0.1.1/w4ve.py
chmod +x w4ve.py && sudo mv w4ve.py /usr/local/bin/w4ve