Does ArcSDE Personal edition still exist in 10.5? Is there still an install?- it's for single user in SQL Server Express.
Yes, it is still available. Look in My Esri under Downloads for ArcGIS Desktop 10.5.1, find the following download: Database Server (Desktop)
That should be what you want.
Also see this doc link: Database servers—Help | ArcGIS Desktop
Thanks! That was the link I was looking for.
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