I see. I had somebody also with a problem related to v4.4 I assume that the problem lies in the blender extensions page side of things. I know the addon works for v4.2 v4.3 and v5.0
If running it in 4.4 is necessary, it is possible to pick up the extension from github -> zip it manually -> and installing the addon.
I can't Install for 4.4 cuz repository is not found, by the comments works only in v5 and upgrading for v5 needs all addons to upgraded, so i'll w8 for that