One of the more odd decisions ive seen. The loop goes like this: install plugin, setup on amazon, setup feed, see a license is required for the free trial, go to website to acquire license, select free version, get forward to the wordpress repository, go back to site, find the register account link, site tells you you need to buy something to setup account, head back to site, click plugins, click deactivate, click delete.
Why it doesnt work out the box is beyond me. Each one of the woocommerce amazon plugin vendors seem to have their own special way of trashing their own product. Bit of an eye opener.