According to the Upgrading/Migrating certification course, EES users must be at 1.40 to upgrade (can do either in-place or parallel). So apparently you'd have to upgrade to 1.40 first in order to then upgrade to 4.5. And for SageCRM, you have to first be at 7.0 in order to go to 7.1. Also fyi, I don't believe you have to disable those Triggers if going from 6.2 to 7.0.