It looks to me that we currently do not support Windows 10. Additionally, OpenSpan 7.0 and 7.1 does not support Windows 8.1. If you move up to Pega Robotics 8.0 you will be able to work in Windows 8.1 (not Windows 8.0).
Please reply whether this information helps out or if you have any further questions!
Hope to see you around the Community!
Lochan | Community Moderator | Pegasystems Inc.