Flowable Upgrade from 6.4.1 to 6.7.2

I just started to upgrade Flowable from 6.4.1 to 6.7.2, Noticed UI modules consolidated into one in the latest version. Also It looks like FlowableAppUser got removed.
what is the alternative for the above class for custom authentication?

Another question, Flowable 6.7.2 intern uses Spring 5.3.14, Boot 2.6.2 ; can i override with latest spring version say 5.6 or 6.0? do you see any compatibility issue with flowable functions?

appreciate your response

Hey @FLOW555,

We removed the use of FlowableAppUser and now we entirely use Spring Security, so you can use whatever you want for that.

Keep in mind that the Flowable UI Applications are only example applications.

You could try to override, but we cannot guarantee that it will work. We have tested the applications with Spring 5.3 and Boot 2.6.