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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 “regedit“
- Select regedit from the search results
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 and then ExpressVpn.
Right-click on ExpressVPN and then click Delete.
After deletion, you should no longer see ExpressVPN under Wow6432Node.
You can now install the latest version of ExpressVPN.