Here’s what Ecotech customer service told me to try, or install Bootcamp on your Mac and use the Windows Radion software:
“Thank you for contacting EcoTech Marine! To resolve the issue you are having.
The mac OSX Catalina user must download legacy Java for OS X 2017-001 from here:
Java for macOS 2017-001 installs the legacy Java 6 runtime for macOS 10.13 High Sierra, macOS 10.12 Sierra, macOS 10.11 El Capitan, macOS 10.10 Yosemite, macOS 10.9 Mavericks, macOS 10.8 Mountain Lion, and macOS 10.7 Lion.
support.apple.com
Go to Application and search for Script Editor.
In script editor - copy and paste the following -
set theDMG to choose file with prompt "Please select javaforosx.dmg:" of type {"dmg"}
do shell script "hdiutil mount " & quoted form of POSIX path of theDMG
do shell script "pkgutil --expand /Volumes/Java\\ for\\ macOS\\ 2017-001/JavaForOSX.pkg ~/tmp"
do shell script "hdiutil unmount /Volumes/Java\\ for\\ macOS\\ 2017-001/"
do shell script "sed -i '' 's/return false/return true/g' ~/tmp/Distribution"
do shell script "pkgutil --flatten ~/tmp ~/Desktop/ModifiedJava6Install.pkg"
do shell script "rm -rf ~/tmp"
display dialog "Modified ModifiedJava6Install.pkg saved on desktop" buttons {"Ok"}
Now press the Hammer Icon.
It should now change color to Black.
Click the play button.
It will ask you now to go find the legacy Java for OS X 2017-001 file you just downloaded from Apple Support.
Click on it and Continue will light up. Run that.
(If there is an error at this point, you have to go into finder and delete/rename any folder called "tmp" as this is what the script is trying to create.
When this script runs, it will create an installer on your desktop called ModifiedJava6Install.pkg to run the necessary Java for the EcoTech Connection Manager.
The connection manager will now install without issue to allow you to connect to your lights again via USB.”