In case somehow your are getting an old copy of the game through the CDN (though in theory this shouldn't happen), can you try downloading instead from one of these alternate links. Let us know if anything changes. Thanks!
Regular Download Links
Windows Link:
https://cdnfiles.ootpdevelopments.co...otp26setup.exe
Mac Link:
https://cdnfiles.ootpdevelopments.co...6Installer.dmg
Windows Single Folder:
https://cdnfiles.ootpdevelopments.co...lder_setup.zip
Mirror Links
Windows Mirror Link:
http://ootpdevfiles.com/ootp/26.1.39/ootp26setup.exe
Mac Mirror Link:
http://ootpdevfiles.com/ootp/26.1.39...6Installer.dmg
Windows Single Folder Link:
http://ootpdevfiles.com/ootp/26.1.39...lder_setup.zip