: Depending on your region, Disney+ has been known to host Digimon Adventure . Their app includes a standard download button for offline playback. Digital Purchase Options
If you want to "own" a digital copy to keep on your device permanently, you can purchase individual episodes or full seasons from:
For the most reliable "download" (physical ownership), you can find remastered Blu-ray sets on sites like Amazon. These often include high-quality English dubs and original Japanese audio.