Curseforge has completed a website overhaul, meaning that users can use either legacy.curseforge.com as well as curseforge.com to download their addons. Anything named "legacy" is likely not long for this world, so Underwolf should be capable of ingesting either a legacy URL or a current Curseforge URL and properly do version checking.
There is a slight downside to using Cuseforge.com over legacy.curseforge.com, which is that CF no longer records the exact update time (in epoch) in its front end. That's what we still use for version checking on the legacy site. Instead, CF provides a month, day, and year on its front end, structured as
Month Day, Year
for example:
Jan 29, 2023
This sucks, frankly, but we'll have to work around it. With the recent "--forceupdate" commit, it's more feasible to support both the legacy site as well as the current one.