Harden installer update activation fallback

README.md

@@ -31,7 +31,7 @@ WinForms tool for controlled Microsoft BizTalk Server 2020 platform operations d
 - Clear and Close actions in the main toolbar
 - No compile-time dependency on BizTalk ExplorerOM assemblies
 - Transactional Windows installer/updater with SHA-256 payload validation and rollback
-- Bounded activation retries plus a verified first-install copy fallback for ACC/EDR rename locks
+- Bounded activation retries plus a verified copy fallback for first installs and atomically backed-up updates when Windows/EDR blocks only the staging rename
 - Installer diagnostics with stable phase codes, complete child-process output, exception chains and a ProgramData-to-Temp log fallback
 - WMI-free runtime self-test plus automated regression test executable
 
@@ -115,6 +115,7 @@ Targeted German inline comments explain non-obvious operational decisions such a
 - [Dokumentation](Dokumentation.md)
 - [Installer stability analysis](docs/Installer-Stabilitaetsanalyse-2026-08-11.md)
 - [ACC activation incident analysis](docs/ACC-Installer-Aktivierungsfehler-2026-08-11.md)
+- [PROD activation incident analysis and 2.2.3 fix](docs/PROD-Installer-Aktivierungsfehler-2026-08-24.md)
 - [ACC runtime shutdown incident and recovery fix](docs/ACC-Runtime-Shutdown-Exception-2026-08-19.md)
 - [AI maintainer handoff](AI-README.md)
 - [References](REFERENCES.md)