As far as I know based upon what Georgia posted BD W8 Security has not been certificed compatible with W10 Technical Preview.
Rumor is W10 Consumer Preview will be released early next year.
Windows 10 Consumer Preview Release Expected In Early 2015
1. Any word on whether BD W8 Security will be compatible with Windows 10 Consumer Preview?
2. Or is there a BD W10 Security Beta in the works to be compatible with Windows 10 Consumer Preview?
3. Or will BD W8 Security users have to switch to a BD 2015 or BD 2016 product at some point in order to use a Bitdefender product with W10?
Thanks