I have no idea what is going on, ArcGIS for Desktop 10.5 works fine to me and I just want to temporary install older version of ArcGIS for Server to see If it could get rid of a problem I encounter earlier with ArcGIS for Server 10.5
You can not install ArcGIS components of multiple versions in the same machine (except web adaptor). You need to either
1. Upgrade ArcGIS Server to 10.5. or
2. Downgrade/uninstall ArcGIS Desktop to 10.4.1. or
3. Use separate machine to install ArcGIS Server.
Got it, looks like 3. would fit my situation. I hope there are spare machine for me to do so.
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