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+---
+sidebar_position: 91
+---
+
+# How To: Block installation based on OS version
+
+It is often desirable to block installation of an application on too old Windows versions. The following sample demonstrates how to block installation on Windows versions prior to Windows 10 version 21H1.
+
+```xml
+
+
+
+
+ = 19044)]]>
+
+```
+
+The sample uses the `SOFTWARE\Microsoft\Windows NT\CurrentVersion\CurrentBuildNumber` registry key to detect the current Windows version.
+
+
+# How To: Block installation on missing or too old VCREDIST
+
+It is sometimes desirable to block installation of an application if the Microsoft Visual C++ Redistributable is either missing or too old. The following sample demonstrates how block installation if the Microsoft Visual C++ 2015-2022 (x64) Redistributable is either missing or predates the 17.2 version.
+
+```xml
+
+
+
+
+
+
+```
+
+Where `36F68A90-239C-34DF-B58C-64B30153CE35` is the UpgradeCode associated with the Microsoft Visual C++ 2015-2022 (x64) Redistributable.