Hello.
I tried it on my 5.5 version with the latest hotfix and it works. I followed instructions and left all settings of web part itself in default values. So, I only imported package (yes, you can import it into 5.x version with no problem) and copied JavaScript file to CMSScripts/jquesry folder.
You can import it as it is described
here. So, you need copy export package into CMSSiteUtils/Import folder.
Best Regards,
Radek Macalik