How to create MM2020 addin?

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Several years ago, I created a MM COM add-in using Visual Studio.  Now I can't seem to find any resources for creating add-ins, however there are companies developing and selling them.  What is the currently supported approach to creating add-ins?  Where are the developer resources?
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Point Solutions Group

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Posted 3 weeks ago

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Marian Kocmanek, Official Rep

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The MindManager 2020 for Windows API is now available at -

We do not offer support for Add-in development. If you need assistance, you may want to contact one of our solutions partners -

Best regards, 
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Alex Gooding, Champion

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This is a great resource, but at the risk of sounding pedantic, while the text of the link to the Windows API shown above is correct, the actual underlying link takes you to a 404 error page. Fortunately this is in the right folder and the table of contents for the API is shown, but it is a little confusing. 
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Sia Banihashemi, Official Rep

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Can you check the link again? It seems to work for me.
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Alex Gooding, Champion

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Sorry Sia, I'm still getting the 404 error on both my PC and iPad, and in several different browsers. I also cleared the cache on the latter.

As I said earlier, the text itself is correct, so if you type that in or copy and paste as text in a browser it will appear correctly. It's the underlying link which is wrong, ie, the following: