So I've now tried with firefox (download never started after 5 min) and finally I am using a download software (this way I hope to be able to resume the download in the middle if necessary). Amazingly, the speed is much higher (although still pretty shameful) at about 50kb/s, estimating 4 to 9 hours, because its driving 10 connections at the same time.
I can't wrap my head around the fact, that this is a cloud offering, download only, trial version (you're supposed to be won over by the offering and service being offered) and the download speed stinks.
Right now its frozen at 0B/s.... connection lost... sigh