VPN update recommendations for Mac on Catalina

Get rid of the VPN entirely. It is doing nothing to protect your privacy or secure your data.

VPNs are designed to connect you securely to a private network such as your employer or school so that you can access resources on their network.

Upgrade your OS. Upgrade your Mac if necessary.

Unless specifically required by an employer, financial institute or educational facility, VPNs aren't recommended and are often implicated in misbehavior on the Mac.

To add and emphasize KiltedKim's suggestion: unless you're using a true VPN tunnel, such as between you and your employer's, school's or bank's servers, they provide false security from a privacy standpoint.  Read these articles:  Pubic VPN's are anything but public and Security Risks: The Dangers of Using Free VPNs (eccu.edu).  

They can also interfere with internet access as we've seen in numerous cases here.