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  • Thanks for your reply @Heiko-Hatzfed, missing assemblies are ICSharpCode.SharpZipLib and one custom assembly. It was developed by a vendor long back, so we do not have the source code or DLL files. Also we could not locate the DLL of installed assembly in old WFE. Commented Mar 28, 2018 at 12:18
  • you have the wsp's for that webpart? Maybe there is more than one version of them? You can extract them and check the contents to see the DLLs Commented Mar 28, 2018 at 17:05
  • Yes, i have the latest version of wsp file. Extracted and checked, DLL is not part of it. Unfortunately we don't have the old versions of WSP file. Commented Apr 10, 2018 at 12:34
  • got the old version of the DLL in the GAC? extract it from the old server and manually deploy it onto the new one (via gacutil)... And make a note in the DR Documentation about it and document the manual change... Commented Apr 10, 2018 at 13:39
  • I see the assembly in the installed assembly library, but i could not find the DLL of that assembly in the GAC. I tried it via gacutil, command prompt but no luck. Commented Apr 11, 2018 at 7:28