It's recommended that you always stay up to date and use the latest animBot version available to your license edition. Please check animbot.ca/versions for more info.
If for any reason the most recent version doesn't work for you or if there is any bug introduced that is preventing you to work, you can always install another version. In order to do so, please visit animbot.ca/versions, look for the version you are seeking and download it. Then follow the instruction in this article to install it. When animBot is launched, it might ask you to update to the latest version and you can simply ignore the request.
Eco and Lifetime Edition users, please read this article for more information about which version is available to you.