You can get the latest versions ("Dev versions") of AuthMe from Jenkins:

• AuthMeReloaded Dev Jenkins – run after every change

In the middle under "Last successful artifacts" download the JAR that is named something like AuthMe-5.6.0-SNAPSHOT.jar (the one with the largest size 😄).

Note: the Jenkins runs after every change, which means it may fix recent bugs but it may introduce new issues as well.