The licensing system used by Horizon (Crypkey) was updated in versions of software 3.6.742.0 and 3.7.742.0 and newer.
Since only one Crypkey service can be installed at a time this means that you cannot use an older version before 3.6/7.742.0 while a newer 3.6/7.742.0742+ version is installed.
In practical terms this means that you are unable to use both Horizon 3.6 and Horizon 3.7 on the same computer unless they are both version 742 or newer.
This will also prevent Horizon 3.4 or 3.5 of any version from being used once a Horizon 3.6.742.0 or 3.7.742.0 is installed.
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