Dear Developers,
From Archicad 30 the Add-On Manager will display the version of the add-ons on the Info area of the Available Add-ons panel.

How to set the version?
If you develop you add-on using the archicad-addon-cmake tools, then it's encouraged that you set the version, otherwise you get a warning if you leave the default "0.0.0" in. This works on both platforms, on Windows and Macintosh.
config.json
{
...,
"version": "30.0.0",
...
}
If you use your own build system, like Visual Studio on Windows, or XCode on Mac, you can set the version in the native resources.
On Windows you can add a VERSIONINFO resource and fill the FILEVERSION field:
VS_VERSION_INFO VERSIONINFO
FILEVERSION 30,0,0,0
...
END
The fourth value, Build Number is not displayed.
On Mac you can add an info.plist and fill the CFBundleShortVersionString key:
<plist version="1.0">
<dict>
...
<key>CFBundleShortVersionString</key>
<string>30.0.0</string>
...
</dict>
</plist>
Happy coding!
Best Regards,
Tamás