You could update to see if the problem is resolved, if not then run the support package
Download problems in my test system W8.1 32bit solved by the update to 2015 R2SP2 (2015_10_2_2218)
Thanks for your help guys.
Tomorrow I will update my production system W8.1 64bit.
EDIT:
Also my download problems in production system W8.1 64bit solved by the upd to 2015 R2SP2