Are you using the Windows or Mac version? For Windows see below.
You can uninstall and reinstall Cartoon Animator 4 using the Reallusion Hub.
When you uninstall CTA4 your purchased content packs and custom content will remain. So, providing you install back to the same location as before all your content will be there waiting for you.
Please Note: It is always recommended to keep a backup copy of your custom content in case of hardware issues. By default, your custom content will be found below. If you chose a custom install path, then you will need to use that to find your custom content.
C:\Users\Public\Documents\Reallusion\Custom\Cartoon Animator 4 Custom