It is always recommended to stay up to date with the latest version of any software to avoid running into unnecessary bugs. This can be done by receiving the latest updates from us. There is one most important thing to remember each time you run the update: Backup! Backup!! Backup!!! Once you've backup the site, you may proceed with the updates.
Updating Vanilla Template
Updating Vanilla template is just as simple as installing over the new template. You can either:
1. Install the latest Vanilla template over the existing installation, or
2. Uninstall the previous version and install the latest version again.
Your css customization in custom.css will not get overwritten by updates.