Problem upgrading JIRA Agile, currently at 8.20.1

[Covance Genomics Lab System Support]

Similar to https://confluence.atlassian.com/jirakb/jira-upgrade-fails-with-error-minimum-build-number-of-45-required-812222943.html ,  when I upgraded JIRA 6.3.9 to 7.0.11, I got errors in atlassian-jira.log:

JIRA Agile Run History

JIRA Agile v6.3.13.1 (a73d75f118867c66) started at 02 Apr 2022 01:34

*JIRA Agile v7.0.11 (63b8de25536543e7) started at 02 Apr 2022 02:56

.....

2022-04-02 15:42:05,361-0400 JIRA-Bootstrap INFO [c.a.jira.plugin.JiraPluginManager] Plugin with key 'com.pyxis.greenhopper.jira' and name 'JIRA Agile' and version '7.0.11' is being updated to version '7.13.0-DAILY20200703023111'.
2022-04-02 15:42:05,726-0400 JIRA-Bootstrap ERROR [c.a.s.core.upgrade.PluginUpgrader] Upgrade failed: This version of JIRA Agile requires a minimum build number of #45 in order to proceed. The latest upgrade task to have been successfully completed is #43. You must uninstall this version of JIRA Agile and attempt an upgrade via an intermediary version.
java.lang.IllegalStateException: This version of JIRA Agile requires a minimum build number of #45 in order to proceed. The latest upgrade task to have been successfully completed is #43. You must uninstall this version of JIRA Agile and attempt an upgrade via an intermediary version.
2022-04-02 15:42:06,300-0400 JIRA-Bootstrap ERROR [c.a.s.core.upgrade.DefaultPluginUpgradeManager] Upgrade error: Unexpected exception caught during plugin upgrade: java.lang.IllegalStateException: This version of JIRA Agile requires a minimum build number of #45 in order to proceed. The latest upgrade task to have been successfully completed is #43. You must uninstall this version of JIRA Agile and attempt an upgrade via an intermediary version.

I tried following the workaround in  https://confluence.atlassian.com/jirakb/jira-upgrade-fails-with-error-minimum-build-number-of-45-required-812222943.html but gave up. Instead, I deleted jira-greenhopper-plugin-7.0.11.jar and proceeded with the upgrade. After 7.0.11, I upgraded to 7.13.18, then to 8.13.5, and finally to 8.20.1.  I deleted the greenhopper jars in each case.

Last year I upgraded 6.3.9 to 8.13.5 but didn't run into the problem with JIRA Agile.

To get JIRA Agile working with 8.20.1, what is the best approach?    Is there a workaround?  Do i need to restart with various greenhopper jars?  I believe we have no Agile data we need to upgrade, so we can start from scratch.