Publish Captivate 9 to IE

Have you looked what the unsupported HTML was?  If you got to project>HTML5 tracker. It will give you a list of unsupported stuff. It may just be a text animation, or something insignificant to performance.

You could publish the project to a webserver, and offer the link. However, know that some LMS's are free (Moodle) and could be a better option.

I would not use the EXE or interactive PDF solution, because both are Flash-based.

How are you planning on hosting it so people with IE can see it?  You need to publish the file to HTML 5, if you do this locally you can go into the directory and find the index.html file that captivate generates and open that with the browser of your choosing.

Sounds to me though that you would like to share it via the web.  Your options would be to host it on a server as a web page, or send the entire file to your users to open locally.  I think you can stlll publish as an .exe for users as well, but I am not well versed with that option.

Hope that helps, I use captivate pretty much exclusively from a web host versus an LMS.  It is a little quirky but for the most part works well.