I do not see SQL optimizer in latest package ToadforSQLServer_Subscription_184.108.40.206.x64.exe
Is it no part of Toad anymore?
Yes, SQL Optimizer is still part of all Xpert Editions of Toad, regardless of the platforms Quest supports. At this time, only the Pro Edition is available via the subscription model.
However, Xpert Edition for Toad SQL Server Subscription is coming in the future 8.1 release... stay tuned!