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.
: 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 Download Digimon Episodes and Movies
: Offers various seasons and the newer films for purchase and download. For the most reliable "download" (physical ownership), you
: Another reliable source for buying digital copies of the films and series. Physical Media (Blu-ray/DVD) Download Digimon Episodes and Movies