What’s new in Unity 6.4?
Update releaseSuperseded

Built-in project checks
Project Auditor is now included in the Editor.

Unsigned package warnings
New prompts flag unsigned packages and packages from outside Unity.

Console quality scaling
Adaptive Performance expands its basic provider to PlayStation and Xbox platforms.

Matchmaking reports
New Matchmaker reports explain why players have not found a match.

ECS included in the Editor
Tools for simulating large numbers of objects now come with the Editor.
Support and release details
Superseded. This Update release has been replaced. Its regular support window has ended.
Released · Reviewed
Unity’s support policy