We are again unable to release new version for JEMH through Atlassian Marketplace due to internal scalability problems with the platform.
The last DC release to Marketplace was 3.3.20-dc (for Jira 8.0.0 - 8.14.1 only - NOTE ! this is NOT COMPATIBLE with Jira 8.15+)
The last Server release to Marketplace was 3.3.19-server (for Jira 8.0.0 - 8.14.1)
Impact is unknown at this time, creating new 'versions' is an automated process behind the scenes.
[Jira 8.15+ compatible downloads]
Until Atlassian resolve the problem we are hosting files on bitbucket (link below). JAR's can be manually installed through "Jira > Manage Apps > Upload App".