Hi IBOX,
The possibility is on p10 is still using SILK and p11 using OutsystemsUI.
We also doing migration from p10 to p11, here is what we do :
1. Download (upgrade) SILK to OutsystemsUI (mobile reactive and web)
2. Open Service studio and change dependency from SILK to OutsystemsUI
3. Fix any error message (usually different parameters on the OutsystemsUI)
Thanks