I'm having exactly the same problem and error message. I cannot uninstall my other VPN client or the antivirus software for the installation because it's a work laptop and I won't be able to get these programs back from home (I'm in home office because of the current COVID-19 lockdown). I have tried closing the other VPN client (Sophos) and deactivating the antivirus software (Avira) for the time of the installation but that doesn't help. There must be a way to install the Pulse Secure VPN client....?
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