Albert Unfortunately, we don’t disclose particular limitations, and they are subject to change if we see that people abuse them. We consider that transfer of the license should be permanent, like in cases of PC replacement, OS reinstall and so on. Migrating back and forth few times a year is an edge case and in general should be fine. However, we cannot give any promises here, unfortunately. To be on a safe side we recommend to secure a license for each PC where you are planning to work with Tonfotos regularly.