Unable to use FDSU2016. Can't go further splash screen.

[Anonymous]

Tried almost everything without success. Unable to use applications at all 😞

1. Tried clean reinstall with OS Tried /NOHARDWARE
2. Tried to change videocard from NVIDIA GTX 560 Ti to ATI RADEON HD7770
3. Tried to do offline activation
4. Tried to delete ADUT in Roaming and in ProgramData
5. Tried to delete FLEXnet in ProgramData and reactivate again

Everytime i've got FATAL ERROR after entering credentials phase. Don't know how to fix this any help appreciated.

[Anonymous]

Forgot to mention that is Desktop Subscription.