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Upgrade to v9.11.0-rc2 may delete DLLs from DNN-Extensions like 2sxc with Imageflow

See original GitHub issue

Description of bug

The Upgrade Wizard deletes DLLs from extensions, so the whole DNN application may not work after the upgrade completed.

Steps to reproduce

Install DNN 9.6.0 with 2sxc 13 (or newer). It will place these files into the bin-folder: Imageflow.Net.dll, Imazen.Common.dll, Imazen.HybridCache.dll and Imageflow (entiry folder)
Unzip the DNN Upgrade Package
Run the Upgrade Wizard
When the Upgrade Wizard completed, the DNN-Application will not start anymore

Current behavior

DNN application does not start anymore. Error because of missing DLLs.

Expected behavior

DNN upgrade should not delete DLLs from DNN-Extensions.

Error information

Error when the Upgrade Wizard completed: Could not load file or assembly 'Imazen.Common, Version=1.0.0.0, Culture=neutral, PublicKeyToken=null' or one of its dependencies. The system cannot find the file specified.

Additional context

2sxc ships with Imageflow (till version 12) and/or Imazen (version 13+). The installation places additional DLLs into the bin folder. They’re own assemblies and not shared with other extensions.