diff --git a/playbook/shopfloor-setup/gea-shopfloor-collections/01-eDNC.ps1 b/playbook/shopfloor-setup/gea-shopfloor-collections/01-eDNC.ps1
index f6e7c42..1446308 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-collections/01-eDNC.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-collections/01-eDNC.ps1
@@ -45,11 +45,19 @@ if (-not (Test-Path $edncDir)) {
 }
 
 # --- Find installer ---
-# Filter is eDNC*.msi (no dash) so we match both vendor naming styles:
-# eDNC-6.4.3.msi (dash) and eDNC_6-4-5.msi (underscore). Imaging dir should
-# only contain ONE version at a time; rollback to a prior version is handled
-# post-imaging via the SFLD share's standard-machine/apps/ alternates.
-$edncMsi     = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" | Select-Object -First 1
+# Default DNC install is the single shared copy staged by startnet.cmd to
+# C:\PreInstall\installers\dnc (currently eDNC-6.4.7.msi) - one source of truth
+# across every DNC pc-type instead of a per-type msi. Fall back to the per-type
+# eDNC\ folder for older images that still bundle their own. Filter is eDNC*.msi
+# (no dash) so both vendor naming styles match: eDNC-6.4.7.msi and eDNC_6-4-5.msi.
+$sharedDncDir = 'C:\PreInstall\installers\dnc'
+$edncMsi = Get-ChildItem -Path $sharedDncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+if ($edncMsi) {
+    Write-Host "Using shared DNC installer: $($edncMsi.FullName)"
+} else {
+    $edncMsi = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+    if ($edncMsi) { Write-Host "Shared DNC installer not found - falling back to per-type: $($edncMsi.FullName)" }
+}
 $emxInfo     = Join-Path $edncDir "eMxInfo.txt"
 
 # --- 1. Install eDNC ---
diff --git a/playbook/shopfloor-setup/gea-shopfloor-heattreat/01-eDNC.ps1 b/playbook/shopfloor-setup/gea-shopfloor-heattreat/01-eDNC.ps1
index f6e7c42..1446308 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-heattreat/01-eDNC.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-heattreat/01-eDNC.ps1
@@ -45,11 +45,19 @@ if (-not (Test-Path $edncDir)) {
 }
 
 # --- Find installer ---
-# Filter is eDNC*.msi (no dash) so we match both vendor naming styles:
-# eDNC-6.4.3.msi (dash) and eDNC_6-4-5.msi (underscore). Imaging dir should
-# only contain ONE version at a time; rollback to a prior version is handled
-# post-imaging via the SFLD share's standard-machine/apps/ alternates.
-$edncMsi     = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" | Select-Object -First 1
+# Default DNC install is the single shared copy staged by startnet.cmd to
+# C:\PreInstall\installers\dnc (currently eDNC-6.4.7.msi) - one source of truth
+# across every DNC pc-type instead of a per-type msi. Fall back to the per-type
+# eDNC\ folder for older images that still bundle their own. Filter is eDNC*.msi
+# (no dash) so both vendor naming styles match: eDNC-6.4.7.msi and eDNC_6-4-5.msi.
+$sharedDncDir = 'C:\PreInstall\installers\dnc'
+$edncMsi = Get-ChildItem -Path $sharedDncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+if ($edncMsi) {
+    Write-Host "Using shared DNC installer: $($edncMsi.FullName)"
+} else {
+    $edncMsi = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+    if ($edncMsi) { Write-Host "Shared DNC installer not found - falling back to per-type: $($edncMsi.FullName)" }
+}
 $emxInfo     = Join-Path $edncDir "eMxInfo.txt"
 
 # --- 1. Install eDNC ---
diff --git a/playbook/shopfloor-setup/gea-shopfloor-nocollections/01-eDNC.ps1 b/playbook/shopfloor-setup/gea-shopfloor-nocollections/01-eDNC.ps1
index f6e7c42..1446308 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-nocollections/01-eDNC.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-nocollections/01-eDNC.ps1
@@ -45,11 +45,19 @@ if (-not (Test-Path $edncDir)) {
 }
 
 # --- Find installer ---
-# Filter is eDNC*.msi (no dash) so we match both vendor naming styles:
-# eDNC-6.4.3.msi (dash) and eDNC_6-4-5.msi (underscore). Imaging dir should
-# only contain ONE version at a time; rollback to a prior version is handled
-# post-imaging via the SFLD share's standard-machine/apps/ alternates.
-$edncMsi     = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" | Select-Object -First 1
+# Default DNC install is the single shared copy staged by startnet.cmd to
+# C:\PreInstall\installers\dnc (currently eDNC-6.4.7.msi) - one source of truth
+# across every DNC pc-type instead of a per-type msi. Fall back to the per-type
+# eDNC\ folder for older images that still bundle their own. Filter is eDNC*.msi
+# (no dash) so both vendor naming styles match: eDNC-6.4.7.msi and eDNC_6-4-5.msi.
+$sharedDncDir = 'C:\PreInstall\installers\dnc'
+$edncMsi = Get-ChildItem -Path $sharedDncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+if ($edncMsi) {
+    Write-Host "Using shared DNC installer: $($edncMsi.FullName)"
+} else {
+    $edncMsi = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+    if ($edncMsi) { Write-Host "Shared DNC installer not found - falling back to per-type: $($edncMsi.FullName)" }
+}
 $emxInfo     = Join-Path $edncDir "eMxInfo.txt"
 
 # --- 1. Install eDNC ---
diff --git a/playbook/shopfloor-setup/gea-shopfloor-partmarker/01-eDNC.ps1 b/playbook/shopfloor-setup/gea-shopfloor-partmarker/01-eDNC.ps1
index f6e7c42..1446308 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-partmarker/01-eDNC.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-partmarker/01-eDNC.ps1
@@ -45,11 +45,19 @@ if (-not (Test-Path $edncDir)) {
 }
 
 # --- Find installer ---
-# Filter is eDNC*.msi (no dash) so we match both vendor naming styles:
-# eDNC-6.4.3.msi (dash) and eDNC_6-4-5.msi (underscore). Imaging dir should
-# only contain ONE version at a time; rollback to a prior version is handled
-# post-imaging via the SFLD share's standard-machine/apps/ alternates.
-$edncMsi     = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" | Select-Object -First 1
+# Default DNC install is the single shared copy staged by startnet.cmd to
+# C:\PreInstall\installers\dnc (currently eDNC-6.4.7.msi) - one source of truth
+# across every DNC pc-type instead of a per-type msi. Fall back to the per-type
+# eDNC\ folder for older images that still bundle their own. Filter is eDNC*.msi
+# (no dash) so both vendor naming styles match: eDNC-6.4.7.msi and eDNC_6-4-5.msi.
+$sharedDncDir = 'C:\PreInstall\installers\dnc'
+$edncMsi = Get-ChildItem -Path $sharedDncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+if ($edncMsi) {
+    Write-Host "Using shared DNC installer: $($edncMsi.FullName)"
+} else {
+    $edncMsi = Get-ChildItem -Path $edncDir -Filter "eDNC*.msi" -ErrorAction SilentlyContinue | Select-Object -First 1
+    if ($edncMsi) { Write-Host "Shared DNC installer not found - falling back to per-type: $($edncMsi.FullName)" }
+}
 $emxInfo     = Join-Path $edncDir "eMxInfo.txt"
 
 # --- 1. Install eDNC ---