According to upgrade guide release notes 3.8 , you have to be running at least 3.6 before jumping to 3.8
ð https://docs.ansible.com/ansible-tower/3.8.0/html/upgrade-migration-guide/
According to upgrade guide release notes 3.7 , you have to be running at least 3.5 before jumping to 3.7
ð https://docs.ansible.com/ansible-tower/3.7.0/html/upgrade-migration-guide/
According to upgrade guide release notes of 3.5 , you have to be running at least 3.1 before jumping to 3.5
ð https://docs.ansible.com/ansible-tower/3.5.0/html/upgrade-migration-guide/