As of ADA 11.1 SP3, Flash is no longer required. From the Release Notes:
11.1 Service Pack 3 (SP3) Features
This release of CA Application Delivery Analysis includes the following new features and enhancements.
Support for .Net framework based UI
This release contains the support for .Net framework based UI. Adobe Flash is removed from the CA Application Delivery Analysis, as it is going to be End of Support by 31st December 2020 to all the users. Existing Flash based Administration (Application) screen is replaced with .Net framework based screen