I've noticed I'm not the only one still using, and still loving, an older Delorme device around here and saw a few other people asking how to import geocache files into their devices. Well for now forget the "Click and Import" plug-ins through your browser. As far as I can tell the browser plug-ins don't work.
I have a PN-60w and a PN-30 camo and have a work around using Topo USA, browsing your device under Windows, or an SD Card reader.
From the "Map" view in geocaching.com, click on the cache icon you want to find and it will open a dialog box describing the cache. Now click on the name of the cache at the top right which takes you to the actual web page for the cache. Next, download it as a GPX file and save it to your Download folder on your computer. Open Topo USA, click on the "Draw" tab, click on "File", and then "Import". Browse to your Download folder, click on the GPX file, and click open. Topo USA will import it as a Waypoint LAYER and from there you can install it how you like on the device, either through an SD card reader or through the Topo USA Exchange. It's not the best option as some of the earlier devices were limited on the number of Waypoints. But it's still better than trying to manually add them or being completely stuck.
If you don't have Topo USA you can still use an SD card reader to copy and paste the GPX file into your "Waypoint" folder. Set your device to "Open SD Card" under the "Settings", "Connect my Computer" screen of your PN series device. If you prefer to install your waypoints on the internal drive then choose "Open Internal Drive".
**Using an SD card reader is BY FAR the easiest and fastest way to import your files. Sometimes Topo USA just gets stuck "Copying..." in the Exchange dialog box. If it does get stuck cancel out and then make sure you are clicking on the Waypoint file and not the Waypoint Layer. You have to click the "+" symbol beside the Waypoint layer to expand the layer and then you can click on the actual file. Once the file is highlighted Topo Exchange will send it right over.