Step1. download OpenVPN

https://openvpn.net/index.php/download/community-downloads.html

Step2. install "TAP-Windows" only

Step3. Go TAP-Windows Folder

> cd C:\Program Files\TAP-Windows\bin

Step4. Edit deltapall.bat by Notepad, if need be.. like below (it needs to set write access)

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pause

"C:\Program Files\TAP-Windows\bin\tapinstall.exe" remove tap0901

pause

"C:\Program Files\TAP-Windows\bin\tapinstall.exe" remove tapoas

pause

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Step5. execute deltapall.bat