HI @Lena
Welcome to the community!
Not required, you can directly upgrade from v6.0 to v6.6.
Please go through intermediate release notes and upgrade notes before the upgrade.
If you're using Crowd for user management, you may have to upgrade to 6.5 first and then to 6.6 due to this bug BAM-19965 that was reported recently.
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It's also Crowd, you should wait for 6.6.1 release which should be published this week. There're few fixes related to upgrades: https://jira.atlassian.com/issues/?jql=project%20%3D%20BAM%20AND%20fixVersion%20in%20(6.6.1)%20ORDER%20BY%20priority%20DESC%2C%20updated%20DESC
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