I agree that link is broken. Hopefully Brolin or one of the other AP folks will see this post and get that fixed.
In the meantime, there are other links that work. Here's a direct link to the download page: https://www.iflygps.com/updateApp/publish.htm
If you're not comfortable clicking on links some random guy on the internet posted in a public forum, you can also get there via the iFly website by using the menu links at the top of every page and following one of these paths:
1) IFLY GPS > Update iFly Portables > Download iFly Connect, then click the orange "DOWNLOAD IFLY CONNECT" button
2) IFLY GPS > Update iFly Portables > Instructions, then click on the "Download and install iFly Connect" link on the left side of the page.