1. Open the mobile app store and search for "15 disk" or "1 15 disk" to find the corresponding application.

2. Click the "Update" or "Version Upgrade" button, and the system will automatically detect whether there is a new version.

When the new version is available, you will be prompted to download and install it. You can choose to download and install the new version now, or you can update it later.

4. The old version 15 network disk has been installed, and the system will prompt for data backup to avoid data loss, so that important data can be backed up before upgrading. 15 network disk account is a free account. Upgrading to the new version will cause some features to be limited or unavailable. If you want to use more advanced features, you need to upgrade to a paid account.