Google makes it easy to install the Android 16 preview with its online Flash Tool

Google has already started work on Android 16, with the first Developer Preview (DP1) build of the new OS version now available to the public. In recent years, the company has followed a release cadence of launching DP1's in the February timeframe, making this an exception to the trend.

Source : https://www.pocket-lint.com/how-to-try-out-android-16-before-launch/