Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)Scientific Software International (SSI) publishes statistical data analysis software: LISREL (structural equation model/SEM, survey generalized linear model/SGLIM), 
HLM (hierarchical linear modeling, multilevel model), SuperMix (mixed models, mixed-effects program, MIXREG, MIXOR, MIXNO and MIXPREG) and Item Response Theory/IRT (BILOG-MG, MULTILOG, PARSCALE)

 
U   Upgrade IRTPRO 4.0 for Windows to IRTPRO 4.1 for Windows

Please note that the installation application on this page is only for end users with active activation codes for IRTPRO 4.0  for Windows.

Release notes for IRTPRO 4.1 for Windows (free upgrade for IRTPRO 4.0 for Windows).

Instructions

  • Use the Windows Control Panel to uninstall the application.
  • Delete the IRTPRO4(x64) folder in C:\Program files (x86)\ if it was not removed in the first step.
  • Use the URL below to save the installation application IRTPRO41(x64)Setup.exe.
  • Ensure that the saved application is approximately 57,611 KB in size. If not, please save it again.
  • Click on the Run as Administrator option on the right-click menu of IRTPRO41(x64)Setup.exe.

     Installation application for IRTPRO 4.1 for Windows (57,611 KB)


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