I realized I actually got deemix from here (download.deemix.workers.dev), not from archive.org. I found the link listed here old.reddit.com/r/…/last_update_is_now_out/ . I don’t know if there’s any difference to the versions we have installed (like, if mine has the webui built-in).
To open the webui, I open the gui app. Wait about a minute for it to log in and start properly. Then I open my browser and type http://127.0.0.1:6595/ . The webui opens up (I had to put the arl once again though). Notice how in my gui app, in the about section it shows my webui version, if doesn’t show up on yours it may not have it (or somehow it isn’t running yet):
Just a reminder, for me it works in the gui version too. I put the spotify username (found here www.spotify.com/us/account/profile/) and find the long alphanumeric username spotify has for my account and paste it in the spotify username field in deemix. Then I go to the Favorites section in deemix, scroll down and can see my playlists.