diff --git a/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1 b/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
index 0721ebc..be7fe63 100644
--- a/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
+++ b/playbook/shopfloor-setup/gea-shopfloor-waxtrace/09-Setup-WaxAndTrace.ps1
@@ -261,21 +261,21 @@ if (-not $asset) {
             $srcDataDir = Join-Path $calRoot 'data'
             $dstDataDir = 'C:\Program Files (x86)\MitutoyoApp\Formtracepak\data'
 
-            $hasBrokenFilenames = $false
+            $bypassVendorSetup = $false
             if (Test-Path -LiteralPath $srcDataDir) {
-                # Get-ChildItem -Filter uses Win32 filtering and does NOT
-                # honor PowerShell wildcards / character classes - '[0-9]'
-                # would match literal bracketed text. Use -Include +
-                # Where-Object regex instead. The bug signature is
-                # ' _' (space-underscore) inside the filename, e.g.
-                # 'Linear_X_218-378-13 _100072210.txt'.
-                $hasBrokenFilenames = [bool](Get-ChildItem -LiteralPath $srcDataDir -File -ErrorAction SilentlyContinue |
-                    Where-Object { $_.Name -match ' _\d+\.txt$' } |
+                # The 218-378-13 probe series has a buggy .NET Setup.exe
+                # that crashes (0xE0434352) even when filenames are clean.
+                # Older ISOs had trailing-space filenames (' _' pattern);
+                # newer ISOs fixed the filenames but the .NET wrapper
+                # still crashes on some path operation. Detect by probe
+                # series in filename OR the trailing-space signature.
+                $bypassVendorSetup = [bool](Get-ChildItem -LiteralPath $srcDataDir -File -ErrorAction SilentlyContinue |
+                    Where-Object { $_.Name -match '218-378-13' -or $_.Name -match ' _\d+\.txt$' } |
                     Select-Object -First 1)
             }
 
-            if ($hasBrokenFilenames) {
-                Write-WTLog "  disc has trailing-space probe-ID filenames (218-378-13 series) - bypassing buggy vendor Setup.exe, doing direct copy"
+            if ($bypassVendorSetup) {
+                Write-WTLog "  218-378-13 series detected - bypassing vendor Setup.exe, doing direct file copy"
                 if (-not (Test-Path -LiteralPath $dstDataDir)) {
                     Write-WTLog "  destination data dir does not exist: $dstDataDir" 'ERROR'
                     Write-WTLog "    (FormTracePak install may not be complete; cal apply aborted)" 'ERROR'