Can we save a Map Package in an older ArcGIS version?
I mean, I would like that someone with ArcGIS 10.4 could be able to open the Map Package that I send him built with ArcGIS 10.7. Is this possible?
It looks like this is possible in the GP tool:
Specifies the version of the geodatabases that will be created in the resulting package. Specifying a version allows packages to be shared with previous versions of ArcGIS and supports backward compatibility.
A package saved to a previous version may lose properties available only in the newer version.
Package Map—Help | Documentation
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