Use the newest SDK above to build all plugins, even when targeting old versions of the sim. Here are older SDK releases provided for legacy purposes only. X-Plane 12 supports the new 4.0 API, and the SDK adds support for ARM64 Macs. Note that these definitions do not automatically imply older version-so, to target X-Plane 12.04 with all the latest features, you would need to define all of XPLM400, XPLM303, XPLM301, XPLM300, XPLM210, and XPLM200.

No XPLMxxx definition-X-Plane 6.70 & newer.To support other versions of X-Plane, you only need to change which XPLM macros your project defines, as follows: Regardless of which X-Plane version you target, you can and should download the latest SDK file above. X-Plane SDK 4.0.1 for Windows, Linux and Mac ZIP You do not need to download any files to run plugins X-Plane ships with the appropriate infrastructure to host plugins. The X-Plane SDK download contains the C headers and pascal interface files to compile plugins, and the stub libraries to link plugins for platforms that need them.

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