"Vanced Manager has a built in setting to change the download server. Download Vanced Manager from Apkmirror, run it, open the three-dot menu, tap About, tap on the Vanced Team box a few times to unlock Dev options. Go back to main screen, open the three-dot menu again, tap Settings, tap the cog on the top right, tap Channel URL, change the URL from
https://api.vancedapp.com/api/v1 to
https://mirror.codebucket.de/vanced/api/v1 and bam, it works."