I already have another VPN software installed. Will it conflict with VPN Unlimited?

If you have installed another VPN software which also uses OpenVPN protocols and drivers, then you won't be able to run both apps simultaneously. So you will have to exit from one application before running another. Note that some VPN applications remove OpenVPN drivers during the uninstallation process, so VPN Unlimited might stop working after you delete them. To fix this issue, simply reinstall the VPN Unlimited app again.