1) So does this mean that I am also allowed to download the DE files in the link above?
Yes. No need to overthink it. The only issue could be serial number recognition, since they are language specific, but you can always try...
hello and thank you for the first answer. Yes, perhaps it works. But I am not wondering if it works technically (Adobe put the files and a serial to that page, so you don't need activation anymore). I asked because of the legal concerns. As you write the serials are language specific I think that it is legally not possible. Perhaps Adobe reads this and thinks about its disclaimers on these pages and if my case is ok (regarding language swap).
I just want to make it right . In case of doubts I continue in EN or change to CS3.