What is best method for installing SP1 - uninstall/reinstall or over top?

I have noticed that Draftsight SP1 (Windows) is currently available for download.

What is the prefered method recommended for installing this?  Should I do a complete uninstall/reinstall or can you install over the top of the current full version?  Is there a way to just download the Service Pack and install that?

Any suggestions would be greatly appreciated.

Thanks,

Chris Pemberton