Specifically, which resource did you download (as there are a number of resources by H. Ironside)?
What was the file name?
Was it a *.zip file?
An *.exe file?
An *.cmtx file?
Where did you put the file?
Hint: Make sure that the resource you are downloading is not for a old version of e-sword (there are still resources for version 8 on the website as well as for Android devices and none of those files would work with the current version of e-sword.)
A quick answer would be that the 'commentary' would appear in the Commentary window.
This file: http://www.biblesupport.com/e-sword-downloads/file/790-harry-ironside-commentaries-on-the-new-testament-and-prophets-updated/
would appear under the tab name "Iron".
I hope this helps.....
Roy