Also, if you check the version information it looks like the free version will not support Confluence Data Center beyond 7.8.3 without using their Pro version:
Although the latest tooltip version 2.1.1 has a much better feature set we are not able to provide the datacenter versions with the same set. Due to the increased number of installations and the maintenance that follows from that we can not longer support the free version of our tooltip for datacenter. Therefore we decided to continue development of tooltip for datacenter only in the PRO version that can be installed from the marketplace.
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