diff --git a/playbook/shopfloor-setup/CMM/lib/Install-FromManifest.ps1 b/playbook/shopfloor-setup/CMM/lib/Install-FromManifest.ps1
index 86b3f07..fcea812 100644
--- a/playbook/shopfloor-setup/CMM/lib/Install-FromManifest.ps1
+++ b/playbook/shopfloor-setup/CMM/lib/Install-FromManifest.ps1
@@ -123,6 +123,22 @@ function Test-AppInstalled {
             "File" {
                 return Test-Path $App.DetectionPath
             }
+            "FileVersion" {
+                # Compare a file's VersionInfo.FileVersion against the
+                # manifest's expected value. Used for version-pinned MSI/EXE
+                # installs where existence alone doesn't tell you whether
+                # the right release is on disk. Exact string match - the
+                # manifest must carry the exact version the vendor stamps
+                # into the binary.
+                if (-not (Test-Path $App.DetectionPath)) { return $false }
+                if (-not $App.DetectionValue) {
+                    Write-InstallLog "  FileVersion detection requires DetectionValue - treating as not installed" "WARN"
+                    return $false
+                }
+                $actual = (Get-Item $App.DetectionPath -ErrorAction Stop).VersionInfo.FileVersion
+                if (-not $actual) { return $false }
+                return ($actual -eq $App.DetectionValue)
+            }
             "Hash" {
                 # Compare SHA256 of the on-disk file against the manifest's
                 # expected value. Used for content-versioned files that do not
diff --git a/playbook/shopfloor-setup/Standard/lib/Install-FromManifest.ps1 b/playbook/shopfloor-setup/Standard/lib/Install-FromManifest.ps1
index 5a3e8dd..1022cfb 100644
--- a/playbook/shopfloor-setup/Standard/lib/Install-FromManifest.ps1
+++ b/playbook/shopfloor-setup/Standard/lib/Install-FromManifest.ps1
@@ -111,6 +111,23 @@ function Test-AppInstalled {
             "File" {
                 return Test-Path $App.DetectionPath
             }
+            "FileVersion" {
+                # Compare a file's VersionInfo.FileVersion against the
+                # manifest's expected value. Used for version-pinned MSI/EXE
+                # installs where existence alone doesn't tell you whether
+                # the right release is on disk (e.g. eDNC 6.4.3 vs 6.4.4
+                # both leave NTLARS.exe in the same path). Exact string
+                # match - the manifest must carry the exact version the
+                # vendor stamps into the binary.
+                if (-not (Test-Path $App.DetectionPath)) { return $false }
+                if (-not $App.DetectionValue) {
+                    Write-InstallLog "  FileVersion detection requires DetectionValue - treating as not installed" "WARN"
+                    return $false
+                }
+                $actual = (Get-Item $App.DetectionPath -ErrorAction Stop).VersionInfo.FileVersion
+                if (-not $actual) { return $false }
+                return ($actual -eq $App.DetectionValue)
+            }
             "Hash" {
                 # Compare SHA256 of the on-disk file against the manifest's
                 # expected value. Used for content-versioned files that do not
diff --git a/playbook/shopfloor-setup/Standard/machineapps-manifest.template.json b/playbook/shopfloor-setup/Standard/machineapps-manifest.template.json
index c7cdfe3..820e993 100644
--- a/playbook/shopfloor-setup/Standard/machineapps-manifest.template.json
+++ b/playbook/shopfloor-setup/Standard/machineapps-manifest.template.json
@@ -14,13 +14,14 @@
       "DetectionValue": "REPLACE_WITH_PINNED_UDC_VERSION"
     },
     {
-      "_comment": "eDNC 6.4.3. Ships with NTLARS bundled (NTLARS.exe lands at C:\\Program Files (x86)\\Dnc\\Common\\ as part of the same install), so no separate NTLARS entry is needed. SITESELECTED encodes the site (was a recurring bug in early shopfloor-setup scripts that omitted it). Adjust to your site's value if not West Jefferson. Detection uses File on the NTLARS binary: catches the case where eDNC is installed but the sub-components we actually care about are missing. DisplayVersion detection via Registry would be tighter but the x86 uninstall key path for eDNC varies across 6.x releases.",
+      "_comment": "eDNC. Ships with NTLARS bundled (NTLARS.exe lands at C:\\Program Files (x86)\\Dnc\\Common\\ as part of the same install), so no separate NTLARS entry is needed. SITESELECTED encodes the site (was a recurring bug in early shopfloor-setup scripts that omitted it). Adjust to your site's value if not West Jefferson. Detection uses FileVersion on DncMain.exe so version upgrades actually fire (File-existence detection on NTLARS would skip the upgrade because the file already exists from the prior version). Update workflow: drop the new MSI on the SFLD share, bump DetectionValue + Installer in this manifest to the new vendor-stamped FileVersion, and the next user logon installs it.",
       "Name": "eDNC (bundles NTLARS)",
       "Installer": "eDNC-6.4.3.msi",
       "Type": "MSI",
       "InstallArgs": "/qn /norestart ALLUSERS=1 REBOOT=ReallySuppress SITESELECTED=\"West Jefferson\"",
-      "DetectionMethod": "File",
-      "DetectionPath": "C:\\Program Files (x86)\\Dnc\\Common\\NTLARS.exe"
+      "DetectionMethod": "FileVersion",
+      "DetectionPath": "C:\\Program Files (x86)\\Dnc\\bin\\DncMain.exe",
+      "DetectionValue": "6.4.3"
     },
     {
       "_comment": "Custom eMxInfo.txt (site-specific eDNC config). No vendor installer - the secret file lives on the SFLD share alongside the eDNC MSI. Install-eMxInfo.cmd copies it to both 32-bit and 64-bit eDNC Program Files paths. Hash detection catches both 'file missing' and 'file is a stale version'. Yearly rotation procedure: drop the new eMxInfo.txt on the share, recompute its SHA256 (PowerShell: (Get-FileHash .\\eMxInfo.txt -Algorithm SHA256).Hash), paste the new hash into DetectionValue here, save. Every Machine PC catches up on the next user logon. Content-sensitive: eMxInfo.txt must NEVER be committed to git (already in .gitignore).",
diff --git a/playbook/shopfloor-setup/common/lib/Install-FromManifest.ps1 b/playbook/shopfloor-setup/common/lib/Install-FromManifest.ps1
index 5a3e8dd..1022cfb 100644
--- a/playbook/shopfloor-setup/common/lib/Install-FromManifest.ps1
+++ b/playbook/shopfloor-setup/common/lib/Install-FromManifest.ps1
@@ -111,6 +111,23 @@ function Test-AppInstalled {
             "File" {
                 return Test-Path $App.DetectionPath
             }
+            "FileVersion" {
+                # Compare a file's VersionInfo.FileVersion against the
+                # manifest's expected value. Used for version-pinned MSI/EXE
+                # installs where existence alone doesn't tell you whether
+                # the right release is on disk (e.g. eDNC 6.4.3 vs 6.4.4
+                # both leave NTLARS.exe in the same path). Exact string
+                # match - the manifest must carry the exact version the
+                # vendor stamps into the binary.
+                if (-not (Test-Path $App.DetectionPath)) { return $false }
+                if (-not $App.DetectionValue) {
+                    Write-InstallLog "  FileVersion detection requires DetectionValue - treating as not installed" "WARN"
+                    return $false
+                }
+                $actual = (Get-Item $App.DetectionPath -ErrorAction Stop).VersionInfo.FileVersion
+                if (-not $actual) { return $false }
+                return ($actual -eq $App.DetectionValue)
+            }
             "Hash" {
                 # Compare SHA256 of the on-disk file against the manifest's
                 # expected value. Used for content-versioned files that do not