I checked it with exactly the same configuration, iPhone 4S with Run.GPS 2.4.3d. I downloaded your route Passo di Tremalzo from Pieve di Ledro through the download cart and it did work for me.
Did you check if downloading works through a different internet provider (e.g. WiFi instead of UMTS)? If so, it must have to do with the provider.
Can you check if the storage on the device is perhaps full?
i am using iphone 4s, run gps trainer 2.4.3 build 2701.
i tried existing routes which i used before and also with those routes I get that error.
Maybe internet provider in Itali?
when I try to download a track on my Phone from the download cart, it gives the following error:
Error getting response stream (ReadDone 2); ReceiveFailure .
How to solve this? I am on the internet and I can upload tranings!!