Following up on this issue. I reinstalled OpenDeck on my laptop where most plugins fail to install. Same issue. Went back one version. Same issue. I went to the site you mentioned, I can see all the plugins. I downloaded the spotify by hand and unzipped it in .config/com..../plugins, but on restarting opendeck it doesn't see the unpacked plugin. Possibly I have to add it to some registry by hand? Anything else I can do to help debug this issue?