Installed Basecamp 4.1.0 onto Windows 7.
Start Basecamp, after connecting Garmin Nuvi 1450, error message pops up "Basecamp application has stopped".
Downloaded file to public on Skydrive. Hope this works.
https://skydrive.live.com/?cid=412e9cbfd591fbd2&id=412E9CBFD591FBD2!103&authkey=!ABXjCNX5Qv3Hz9c