If you don't want an installer, you can download the pluginsonly bundle on the release page and do it yourself: https://github.com/surge-synthesizer/releases-xt/releases
Plenty of plugins just ship with a README and tell you where to drop em though! Even paid. So especially if it's OSS I don't think it's bad to require a bit of effort from the user especially if it takes unpaid time maintaining the installer wrapper. Thanks for the bundle link!
(e.g. C:\Program Files\VSTPlugins )
Anyone producing music from qubesOS?
Privilege escalation is a big issue for servers and mutualized systems. On a personal computer this is the least of your concerns as your personnal data is more valuable than some binaries in your root filesystem. People are ready to get their precious data pwned or ransomwared but are afraid some process would get root access, this is backwards thinking.