Hi,
Hopefully you can get WiFiLogger connecting and uploading.
However, if you wish to us a WLL:
The WLL does not upload to anything else than Weatherlink.com, and it is Weatherlink.com that can directly upload to WU, CWOP and WOW.
You cannot use WLL with WeatherlinkPC software on your PC.
WLL will also store data while your internet connection is down, and will automatically update the data to WL.com when internet is restored.
WLL data can be used as live data by third-party programs like CumulusMX and Weather Display, using the WLL local IP address.
If you have a WL.com Pro subscription then the third-party programs like CumulusMX can catch-up data from WL.com for the time the program may have been shut down. WLL allows as many programs as you like (i.e. CumulusMX and Weather Display at the same time) to access the live or catch up from WL.com Nothing else would be needed.
I can't speak for Weather Display but CumulusMX is quite easy to install and use including by a novice. While WL.com does not directly upload to PWS Weather, nor some of the other weather sites like Windy, the third-party programs can upload to many of those including PWS Weather.
WL.com saves data at 15 minute interval on the Basic free plan, and can be changed to 5-min on the Pro plan (and 1 min on the Pro Plus). The WU, CWOP and WOW updates are at 15 minutes on the basic plan, and can be set at 5 minutes on the Pro plan.
Enjoy,
Paul