You can test your current M2E Pro set up on Magento 2 and you don’t need to stop the synchronization process on your Magento v.1. 

In this article customers that are new to M2E Pro can find out how to test the Module on Magento 2.

In this article customers that are new to M2E Pro can find out how to test the Module on Magento 1.

Find out how to link your Unmanaged Item to another Magento Product after it had been moved to the M2E Pro Listing.

Check M2E Pro version in a few clicks.

Read how you can import missing orders or order data into M2E Pro.

Learn why it is necessary to configure related Magento Store Views for Unmanaged Listings and how to do it.

To change a login email of your customer account on Clients Portal, follow the steps from the article

Learn what to do if you want to make the product non-visible in your Magento store but still list it on Channels via M2E Pro.