Rhino 6 asks for license key after using Rhino 7 WIP

just installed latest WIP, (7.0.19260.11525, 17/09/2019)
Rhino Version 6 SR18 (6.18.19253.10261, 10/09/2019)

Rhino 6 always ask for license key after using Rhino 7 WIP, is there any way to fix that?

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