How many websites I can manage with single Store Manager license?
Depending on Store Manager for Magento version, you can manage definite number of sites.
Store Manager for Magento Standard Edition Limitations
With Standard license you get an opportunity to manage only one Magento installation (with multiple websites and store views). For more connections to multiple Magento websites you will need Professional or Enterprise version of Store Manager. For more details on difference between editions, check our plans and pricing page.
Store Manager for Magento Professional and Enterprise Edition
According to our policy, for those editions we allow you to manage as many stores as you wish, but you will need a separate license for each computer: 1 license=1 computer.
For your other computers we offer Additional licenses that are issued with a discounted price. Also there is a 1+1 pack to get 1 (for PRO) or 3 (for EE) additional licenses free of charge.
Check more about our licensing in our License Agreement - https://emagicone.com/license-agreement/