Hmm, I created those folders and tried to download Zap again with using sudo at the beginning (sudo go get -d github.com/LN-Zap/zapconnect) but now getting the original error message (package github.com/LN-Zap/zapconnect: cannot download, $GOPATH not set. For more details see: go help gopath)
Try running that command without sudo. Also, check what has happened to $GOPATH by typing in
go env. If it has changed then use the previous two echo commands to set it again.