The cause was that the UIFlow communication was being blocked by a firewall.
The problem has been solved.

When I checked the log of UIFlow startup in the Mac console application, the tccd process produced the following log.

Failed to copy signing info for 2684, responsible for file:///private/var/folders/vp//T/AppTranslocation/----**/d/UIFlow-Desktop-IDE.app/Contents/MacOS/UIFlow-Desktop-IDE: #-67062: Error Domain=NSOSStatusErrorDomain Code=-67062 "(null)"

I tried both methods, but they didn't start.

Are previous versions of UIFlow-Desktop available to the public?
If so, I would like to try to run a past version of it.

I dragged it to the application folder, but it didn't start.

I downloaded the mac version of UIFlow from the official web site of UIFlow.
The download was completed, I tried to unzip and start, but the window of the UIFlow of the white background was displayed and does not start.

How do I solve this problem?

OS version: mac OS catalina 10.15.4