After upgrading to 8.15.0 core, I can no longer install JIRA software. I've tried going to 8.16.0, same issue. I just get a "An expected error occurred. Refer to the logs for more information". I'm a bit stuck since I cannot install, nor license JIRA software anymore.
Help! 
Only thing in the log is:
2021-04-10 07:49:05,329-0600 UpmAsynchronousTaskManager:thread-4 INFO vdi 455x859x6 1lu2leq 192.168.2.100 /rest/plugins/1.0/installed-marketplace [c.a.plugin.loaders.ScanningPluginLoader] No plugins found to be installed
2021-04-10 07:49:05,513-0600 UpmAsynchronousTaskManager:thread-4 INFO vdi 455x859x6 1lu2leq 192.168.2.100 /rest/plugins/1.0/installed-marketplace [c.a.plugin.manager.DefaultPluginManager] Updating plugin 'com.atlassian.jira.jira-software-application' from version '8.16.0' to version '8.16.0'
2021-04-10 07:49:05,521-0600 UpmAsynchronousTaskManager:thread-4 INFO vdi 455x859x6 1lu2leq 192.168.2.100 /rest/plugins/1.0/installed-marketplace [c.a.plugin.loaders.ScanningPluginLoader] Removed plugin 'com.atlassian.jira.jira-software-application'
2021-04-10 07:49:06,460-0600 UpmScheduler:thread-2 WARN vdi [c.a.upm.pac.PacClientImpl] The request to check for app updates may take longer than expected because 194 apps are installed that could have updates. This may impact the performance of loading the Manage Apps page.
