Choose the version for your computer: macOS for Apple silicon and Intel, Windows x64 for Intel and AMD, or Windows Arm64.
On a Mac, open Drift.dmg from your Downloads folder, drag the Drift icon into your Applications folder, then open Drift from Applications. On Windows, open the Drift installer from your Downloads folder, then run it and follow the steps.
The Mac app is one universal app that runs on both Apple silicon and Intel. Windows comes in x64 and Arm64 builds. Open Drift and sign in with your Drift account. The desktop app updates itself.