Where to find Register Key or some other api for plugin folder installation path. Thank's. Gigi

There is no registry value. From the documentation:

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For 64-bit applications (Event Server, Management Client and Smart Client installed as 64-bit):

Executing folder of the starting application:

   ".\\MIPPlugins". 

A common place that all Milestone and OEM applications load from:

   [C:\\Program](file:C:/Program) Files\\VideoOS\\MIPPlugins 

A common place that all Milestone applications load from:

   [C:\\Program](file:C:/Program) Files\\Milestone\\MIPPlugins 

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Ref. https://doc.developer.milestonesys.com/html/index.html?base=gettingstarted/plug-in_development.html&tree=tree_search.html?search=plugin+folder

I also recommend: “Debugging techniques for developing XProtect Smart Client plug-ins" and “Debugging techniques for developing XProtect Management Client plug-ins"

https://developer.milestonesys.com/s/article/debugging-techniques-for-Management-Client-plugins

https://developer.milestonesys.com/s/article/debugging-techniques-for-Smart-Client-plugins