@Denis M Goddard

This should give you the current latest release of git-ssb (v2.8.0):

ssb-npm install -g git-ssb --branch %xlfr8klBuPNiHSXQ5uq2HkrIWudCz9Zzs9jiBoJBz3s=.sha256

Or you could try the binary release, referenced in %3RWdXwI....