Plese make sure that latest theme version is compatible with your WHMCS installation!
Make a full backup of your WHMCS server.
If you've made customization to any Lagom theme files, we suggest to compare those files with new theme version files, and merging all new changes.
We suggest testing latest releases of our theme on your development environment, before installation on live environment.
Download latest theme release and extract downloaded zip file.
Extracted folder and upload it's content to your WHMCS server.
Clear your browser cache and server cahce if you have any (for example Cludflare).
Clear WHMCS template cache, go to: Utilities > System > System Cleanup > Click "Go" next to "Empty Template Cache".