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# <ol><li> You need to '''rename''' all RealVersion or Version registry keys containing 10.2 or 10.2xxx with RegEdit '''BEFORE''' installing {{IMSMANG}}.
:Take detailed notes on which keys you changed and what was the original names e.g. ''RealVersion'' in ''Computer\HKEY_LOCAL_MACHINE\SOFTWARE\ESRI\ArcGIS'' was renamed to ''RealVersionNew''.
{{ Images| PrSc from Registry with ArcGIS 10.2 are missing}}
# <li> Install {{IMSMANG}}# <li> Activate the license from the {{IMSMANG}} Client Configuration tool# <li> Open ArcGIS administrator# <li> In the lower left part of the window, you see a dropdown list where you can select version. Select 10.1# <li> Activate ArcEngine 10.1 as you usual do# <li> Start the {{IMSMANG}} client and verify all seems OK# <li> Start ArcGIS and test both ArcMap and ArcCatalog.
If '''both''' {{IMSMANG}} and ArcGIS works well then
# <li> Rename all RealVersion or Version registry keys created for 10.1 to e.g. ''RealVersionOld'' and rename back all 10.2 registry keys that you have modified in #1 to the '''original''' name e.g. ''RealVersion''# <li> Restart the computer and test '''both''' {{IMSMANG}} and ArcGIS again.</ol>
If you did not get it to work then you have to