For a Vendor, making an app Data Center compatible is actually quite a lot of work. Atlassian requires Vendors to answer a questionnaire, submit extensive performance testing results, and provide an SLA for Data Center customers. Even if the Vendor of that app decided to do all of that for free, it would probably fail with the requirement of an SLA - as the free app isn't supported (as listed on the Marketplace).
Unfortunately there's no incentive for Vendors of free apps to make them Data Center compatible. If you are in dire need of a Data Center version of that app you could maybe try contacting the Vendor directly and offer them to pay for the expenses of the process.
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