You can get Android 15 QPR1 in any of the following ways:
Get QPR1 on a Google Pixel device
You can flash or manually install the latest Android 15 QPR beta build on your Pixel device. The recommended way to flash Android 15 QPR1 to a Pixel device is to use Android Flash Tool.
If you'd rather flash your device manually, you can get a system image for your device on the Factory images for Google Pixel page. See the general instructions there for how to flash a system image to your device. This approach can be useful when you need more control over testing, such as for automated testing or regression testing.
Get a generic system image (GSI)
Android Generic System Image (GSI) binaries are available to developers for app testing and validation purposes on supported Treble-compliant devices. You can use these images to address any compatibility issues as well as discover and report OS and framework issues.
See the GSI documentation for device requirements, flashing instructions, and information on choosing the right image type for your device. Once you're ready to download a GSI binary, see the Downloads section on the GSI binaries page.