Turn on the "Unknown Source" option: In the device settings, find the "Security" or "Application" option, and then turn on the "Unknown Source" option to allow the installation of applications from unofficial sources.
Download the application installation package: Search and download the installation package (APK file) of the third-party application through the browser or application store.
Install the application: click the installation package to install it. During the installation process, you may be prompted that you need to grant some permissions to the application, and follow the prompts.
Find and use applications on the device: After installation, you can find and use third-party applications in the application list of the device.
There may be some differences between different YVR all-in-one models and operating system versions. The above steps are for reference only. When installing third-party applications, it is necessary to ensure reliable sources and avoid downloading and installing applications of unknown origin, so as not to cause equipment security problems. If you encounter problems during installation, you can try to consult the user manual of the equipment or contact the customer service support of the equipment manufacturer.