As of April 2022, the migration process can be performed from M2E Pro v6.21.3 on Magento v1.x to M2E Pro v1.21.3 on Magento v2.x.
Start the migration only after you successfully install both required Module versions. Once you confirm the migration running, your Module on Magento v1.x will be put under maintenance and the process cannot be stopped.
During the migration, all M2E Pro data will be saved, including your Channel Sales, Product and Order logs, Scheduled and In Progress actions, etc. Read more here.
Some features may work differently or be temporarily unavailable in M2E Pro Magento v2.x. More details can be found in our Migration Notes.
If you want to test how M2E Pro works on Magento 2, here is an article with instructions.