1. Is not v6.11 much outdated?
The latest is v6.13 as of July 4th, 2018.
2. How to keep portabolized EN updated?
You cant. Just need to make another portable from a newer setup version. This means notebook has to be synchronized anew.
3. If standard EN updates run under Sandboxie... would this not also accomplish also keeping WIN 10 OS registry-FREE and clean?
Portable version does not add anything new into the registry.