1. Open your preferred online music store (e.g., iTunes Store, Amazon Music, Google Play Music, etc.).
2. Search for "Britney Spears" or "One More Time" in the search bar.
3. Find the "One More Time" song or album by Britney Spears and click on it.
4. Click on the "Buy" or "Purchase" button and follow the payment instructions.
5. Once the purchase is complete, the song or album will be added to your account and you can access it by signing in to your account and going to your music library.
Option 2: Stream and Download from a Music Streaming Service
1. Open a music streaming service that you subscribe to (e.g., Spotify, Apple Music, Tidal, etc.).
2. Search for "Britney Spears" or "One More Time" in the search bar.
3. Find the "One More Time" song or album by Britney Spears and click on it.
4. Look for the "Download" or "Offline Listening" button. This button may vary depending on the specific streaming service you are using.
5. Click on the "Download" button and wait for the song or album to download.
6. Once the download is complete, you can access the song or album offline by going to your downloaded music section in the streaming service's app.