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I am seeing a similar issue. When I tried to add SparkFun Apollo3 Boards using the Arduino boards manager, I get the following error:
Error downloading
java.lang.RuntimeException: java.lang.Exception: Error downloading
at cc.arduino.contributions.packages.ui.ContributionManagerUI.lambda$onInstallPressed$2(

I have added all of the following URL's to the boards manager in preferences:

Interestingly, I was able to add the Apollo v1.2.3, however I still get the above error when I try to update it to the current version. I also tried uninstalling and re-installing the Arduino IDE, which did not solve the problem.
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