I’m running on the latest version of everything, so if the latest HACS is v2, then yes.
Perhaps my biggest question would be: Why isn’t the upgrade backwards compatible? Upgrades should not break existing configurations. (Especially, after I spent atmost 12-months getting the ‘look-n-feel’ just how I wanted it.) Very frustrating.
The problem is not that the theme made a breaking change. HACS v2 made a backwards incompatible change which resulted in theme files (except for the yaml) not being distributed and downloaded anymore. Therefore, we needed to make a change. We first added the background images as base64 but got reports regarding performance problems. So I switched to 2 options, getting the image from a url or locally. In the latter case the user must download the images manually.
Where do I get it from? (I assume the name will be obvious)
Where do I dump it?
Then, I presume I do a restart of HA to make it active.
UPDATE: No need to answer this post. I left everything alone for about four hours and checked again. Mysteriously, The CSS modifications took effect again. As of writing, the home page now looks like my old home page. The only thing I changed was the theme from “ios-dark-blue-red-alternative” to “ios-dark-blue-red”. Very weird.