Hi @dwraesner , the Upgrade Readiness App's most recent version was released on Feb 5, 2020; the newest version for the Add-on for Cisco ISE was released after this, on Feb 11, 2020. The readiness app pulls a static list from Splunkbase before each release. As a result, it likely doesn't know that the newest version of the add-on is actually compatible (and if you look on Splunkbase, you'll see it is). In short, you should be good to go for that app.
As a note, Splunk does not have a conversion script available, but you can use dual-compatible Python libraries to achieve this.
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