Archicad C++ API
About Archicad add-on development using the C++ API.

How to get Archicad 25, or older versions, and which do i need?

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I'm trying to get into tool / extension development for a project that is currently using Archicad 25. I have the Developer SDK for 25 installed. I am now trying to install Archicad 25 trial but am unable to get to anything other than 26. Will 26 work for testing an extension written with the 25 sdk?

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Just use this link but change the last letters to your localisation code. 
https://Graphisoft.com/downloads/Archicad/install/AC25/INT

Lee Hankins
ArchiCAD 4.5 - Archicad 28 Apple Silicon 27.3 | 28 Apple Silicon
macOS Sequoia (15.1.1)