AR-CLUSTER 6.6.205.0 x64 TRIAL CANDIDATE
October 30, 2026
Changes since published Trial 6.6.200.0

PC92 TOPOLOGY PERFORMANCE

- Cache bounded node reachability across user-only membership changes while
  preserving immediate routing and membership updates. Structural, route,
  session, identity, expiry and ambiguous changes invalidate or bypass the
  cache. Introduced in private .201.
- Construct warm route unions directly from cached nodes and current user
  relationships, avoiding temporary per-peer destination collections. Cold
  traversal and direct-peer route precedence are unchanged. Introduced in .203.
- Compare the five retained projection components exactly without allocating
  the previous large aggregate comparison string. Existing equality and rebuild
  decisions, including separator-collision behavior, are preserved. Introduced
  in .204.
- Reconcile ordinary remote-user add/remove projections through bounded reusable
  indexes when the node graph, direct transports, local users and identity state
  are proven unchanged. Complex or ambiguous changes retain the full projection
  path. Introduced in .205.

Offline differential checks matched 2,484 service snapshots and 11,001 equality
cases. NC7J-3 canary checks passed. During the overnight NC7J soak, the mature
.205 sample had nearly the same graph as the retained .200 baseline, more users
and higher filtering work, while measuring 30.5% lower CPU, 25.3% lower total
allocations and 21.4% fewer GC starts. Results vary with workload and are not a
universal performance guarantee.

Investigation, direction, implementation and qualification: NG7M.

SECURITY CHECKPOINT RELIABILITY

- Preserve valid learned-security events whose concurrent callers acquired the
  admission gate in a different timestamp order. Detached save records and
  private restore views are sorted only after validating every retained value.
- Preserve learned identity evidence, cooldowns, reconnect escalation,
  quarantine qualification, temporary holds and duplicate fingerprints without
  resetting samples or extending their original deadlines.
- Security policy, configured modes, thresholds, checkpoint schema and periodic
  write interval are unchanged.

The corrected save/reload cycle passed offline persistence checks, NC7J-3 restart
validation and the overnight NC7J soak. Investigation, implementation and
qualification: NG7M.

INSTALLED APPS AND PROGRAMDATA MAINTENANCE

- Windows Installed Apps Modify can move a selected stopped instance's data to
  its owned ProgramData location after the instance has been upgraded or repaired
  with the current Setup.
- Revalidate registration, installed version, cached Setup digest, stable instance
  GUID, data ownership and pending-operation state before moving any data.
- Preserve configuration, databases, lists, logs, learned security state and
  recovery sidecars. Verify copied contents and database state before committing
  the binding and refreshed maintenance registration.
- Retain the original data and leave ARC6 stopped. The operation does not merge
  folders, automatically stop the node or automatically restart it.
- Scripted upgrades refresh and verify the maintenance catalog, Installed Apps
  registration and cached maintenance tools. ProgramData maintenance logs use
  the same timed steps and readable completion summary as other Setup operations.
- Align the Installed Apps maintenance choices and remove unused initial dialog
  space.

NG7M successfully completed the manual .205 installation and ProgramData move on
NC7J. Migration question and feedback: Dave K1TTT and NG7M. Direction,
implementation and qualification: NG7M.

UPGRADE NOTES

- This is an x64 Trial candidate. Upgrade one selected instance first and retain
  its backups, maintenance folders and original data.
- Existing connection, filter, security and read-only API settings are preserved.
- Review README-MANUAL.txt before running ARC6-Setup.exe.
- The compact standalone ZIP is for manual Setup. It is not interchangeable with
  the automatic-updater package format.

