Same problem here. I reinstalled Switch from a XP machine to a new one, as the old one went down these days. After entering my registration data, I still couldn't convert dss-files, as Switch claims that this format is not supported. I used one of our archived dss-files, which already worked in Switch. Is it possible that Switch didn't upgrade to Switch Plus, which was capable of converting dss-files, after entering my registration data? How can I tell the difference between Switch Plus and Non-Plus?