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Unable to install OctaneRender Server 11.20. File says: Error opening file for writing. C:\Program Files\OctaneServer\octane.dll. Click abort to stop installation.

This works ok now. I turned my computer off and then on and it was able to install with no problem.


Windows 10
GTX 960M
16 GB RAM
OctaneRender for Blender 3.05.1 v. 11.20

All works absolutely OK. Make sure you don't have the OctaneServer process still running when you install it.