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'''Try''' first with '''not''' uninstall ArcGIS with higher version than 10.1 before installing {{IMSMANG}} including ArcEngine.
If you already have ArcEngine installed and then you want to install a newer version of ArcGIS then you need only to rename the registry keys so the installation program will start.
=== All versions ===__NOEDITSECTION__
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<li> You need to '''rename''' all RealVersion or Version registry keys containing e.g. 10.2 or 10.2xxx with RegEdit '''BEFORE''' installing {{IMSMANG}}starting the installation of ArcEngine.
: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''.
Depending on which ESRI products are installed the number of registry keys that need to be renamed varies. They are all found in the main registry key''HKEY_LOCAL_MACHINE\SOFTWARE\'''Wow6432Node'''\ESRI\ArcGIS''Examples:* HKEY_LOCAL_MACHINE\SOFTWARE\'''Wow6432Node'''\ESRI\ArcGIS\RealVersionrename to e.g. RealVersionNew* HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ESRI\Desktop10.2\RealVersionrename to e.g. RealVersionNew* HKEY_LOCAL_MACHINE\SOFTWARE\Wow6432Node\ESRI\Desktop10.2\CoreRuntime\RealVersion* Depending on configuration and extensions there might be more registry keys that needs rename to be renamede.g.RealVersionNew
<li> Install {{IMSMANG}} including ArcEngine
: [[Image:Error message ArcEngine.png| 300px]]<br>
</ol>
=== Version 10.4 -> and ArcGIS Pro===__NOEDITSECTION__
Starting from ArcGIS 10.4 the ArcAdministrator is so different that it is not possible to active our license for ArcEngine 10.1 with the ArcAdministrator.
:[[Image:ArcGIS administrator 10 5.png|300px]]<br>