Converting from Mac to windows

Check the full version numbers under Help, About Captivate. Both should start with 11.5 although the version number of the Mac version may be slightly different (due to a patch which was needed for the most recent Mac OS).

There is no difference between Mac and PC versions of CPTX files, however a prerequisite for exchanging versions of your project files from one platform to another is that you are all using the most up to date version of Captivate. For example, hypothetically if I'm using Adobe Captivate 2019 version 11.5.4.199 and you are using Adobe Captivate 2019 version 11.0.1.266, you will not be able to open files I send you. The reason for this is that my version of Captivate includes features that were not in your version and your version of Captivate won't know what to do with those elements in the project file.