Here is how to download new version manually and update script.
Log in to your account on classibase.com website. Navigate to member are and download latest version of classibase zip file.
Unzip downloaded files to separate folder and remove following folders/files from it if they exist:
- /.htaccess
- /favicon.ico
- /user-content/
- /sys/config.php
Those files should be on your existing installation. Then copy all other files and folders to your server, override existing files.
Check free tools for uploading files via FTP.
Read this tutorial to manually update classibase theme.