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If you see the following error message in your installer log:
Error 1721. There is a problem with this Window Installer package. A program required for this install to complete could not be run. Contact your support personnel or package vendor. Action: Uninstall3x, location: C:\Program Files (x86)\ExpressVPN\Uninstall.exe, command: /S"_?=C:\Program Files (x86)\ExpressVPN\""
Click Start (or hit the Windows key) to open the Start Menu.
- Type “run“
- Select Run under “Programs” to open the Run dialog box
In the Run dialog box, type “regedit” and click OK.
You will now see the User Account Control dialog box. Click Yes to proceed.
In the Registry Editor, under Computer, double-click on HKEY_LOCAL_MACHINE.
Under HKEY_LOCAL_MACHINE, double-click on SOFTWARE.
Under SOFTWARE, look for Wow6432Node and select ExpressVPN.
Right-click on ExpressVPN and then click Delete.
After deletion, you should no longer see ExpressVPN under Wow6432Node.
You can now proceed to installing the latest version of ExpressVPN. Instructions to do this can be found here.