You are correct. You shouldn't be confused with anything. Please do NOT follow the links (even when I know they are correct for the current latest Avast editions).
Simply go to the official download web page, download the trial version of the same Avast edition you know you purchased. By selecting it by yourself (instead of some link in some email or some post) you should be certain to follow your own eyes.
Install that trial version and then reboot. Try that version for several days. Once everything works correctly, go to the original email with the license code and use it to validate your Avast installation (so to transform it from trial to registered).
After that, reboot and keep testing for several days.
At any step you find something not clear, please consult by yourself the support pages of the official site of Avast. There are many knowledgebase articles, about the license, about the removal utility, about other more technical issues and even about sales.
You may use the help included in Avast too.
Only after checking all those simple sources of information, you might want to come back to ask again, so experienced users may help you with many questions that you might not have found an answer to yet.