We are currently on version 3.6.0.2 and we would like to upgrade to 3.7.0.1 as it has the "ignoredGatewayIPAddressesForSpfCheck" feature we would like to use.
We only purchased the product a few months ago so no issue with license.
What is the upgrade process? Can I install over the top of the previous version or do I need to uninstall/reinstall?
If I can install over the top will it reset my configuration/licenses?
I haven't found any documentation on the correct procedure and would just like to know the preferred method with the least downtime.
Thanks.

Hi, if your license is still in free upgrade period (12 months), you can download the latest version from our site and run the installer directly without uninstalling current version, the installer will execute the upgrade automatically.

Your setting will be kept, but to get new inbound agent configuration template, before you run the installer, please backup your current DkimInboundAgent.dll.config, then delete it from DKIM installation path. After the upgrade is finished, you can find the new DkimInboundAgent.dll.config.