You will need to install via the zip file provided. Just unpack it. You won't have the menu start bars but the deploy_start and deploy_stop commands should be sufficient.
Incidentally there is a mac installer in 3.4, but don't be tempted to use the 3.4 version of the SDR with Alfresco 3.3.
However, after unzipping, I was unable to run deploy_start.sh. I get the following: -bash: ./deploy_start.sh: Permission denied
I am guessing no installation means the permissions on any of the files in SDR never got set? Help please.
Alfresco Web Server and Alfresco Virtual Server are already running. I can start them fine from Terminal by running commands, ./alf_start.sh and ./virtual_start.sh, respectively.