The XOP Toolkit includes libraries and sample projects for the following development systems:

• Windows
•  
  • Visual C++ 2015 (express or professional editions)
  • Visual C++ 2017 (express or professional editions)
  • Visual C++ 2019 (express or professional editions)
  • Microsoft Visual C++ Express Edition (free) is fine for most XOP development.
• macOS*
•  
  • Xcode 11
  • Xcode 12
  • Xcode 13
•  

Xcode XOP Project

Visual C++ XOP Project

*macOS support

Igor Pro 10 and later run on only Windows 10 and later. The no-longer-developed Igor Pro 9 is the final version that runs on macOS. For more details, see the Platform Support page.