Treat model assets as versioned application dependencies.
1. Download lifecycle
Download to a temporary location and support interrupted transfer recovery where available. Check available storage before beginning and show progress without blocking normal app use.
2. Integrity and atomic activation
Verify expected size and cryptographic hash before activating a package. Switch the active version atomically so an interrupted update cannot leave a half-written model in use.
3. Cache and deletion
Define which model versions may be removed and preserve a known working version during rollout. Provide a user-visible storage policy when assets are large.
Worked scenario
The process dies halfway through a model update. On restart the previous verified model remains active and the incomplete package is not loaded.
Apply it
Implement a fake download installer and test interruption, wrong hash, low storage and version rollback.
Check your understanding
Only a fully verified package becomes the active model. Explain the decision and show evidence from your implementation or design. If you cannot demonstrate it yet, revisit the relevant section before continuing.