The current Sequencher KeyServer Server release supports OS 10.7 through 10.11 and will serve Sequencher 5.2 and newer. It will not serve a license to older versions of Sequencher. The legacy Sequencher Server, 6.2.1 (which also requires a Network hardware key), is available to support older versions of Sequencher and will install and run on Mac OS 10.4 through 10.8. You can find this version on our legacy support page.
The current Sequencher RLM Server release supports OS 10.5 through 10.9 and will serve Sequencher 5.2 and newer and does not require a Network hardware key.