Hi to all, maybe this info is outdate for somebidy but i want to share.
In my case: remove DS SPARK V10 i have used REVO UNISTALLER TOOL for total and secure clean;
reinstalled DS PARK v11 (the v10 is out of date and not supported now) remember ADMINISTRATOR RIGHT;
Change your PASSWORD of login in DESIGN SPARK site (is the same for login software) and use a simple password that does not exceed 11 characters;
My experience Sergio.