The Launcher is a bit picky about which ROM revisions it accepts by default. See here for more information: http://fengestad.no/fs-uae/kickstarts. You can also specify a custom kickstart file in the hardware tab in FS-UAE Launcher if you do not have the preferred ones.
Not being able to click on the warning is a bug though, thanks for reporting it. It works on other platforms. I’ll fix that for the next version (it doesn’t do anything other than opening the import kickstarts dialog).