[feature request] Improve weights download logic and robustness

[MarcelRosier]

Currently there is no way to update model weights, delete old weights, redownload automatically after download errors etc. Improve this

[neuronflow]

We could save the package version number in a file next to the downloaded weights and always cross-check the version. If the package number changes, this would trigger a re-download of the weights.

The downside is that this would create a lot of unnecessary traffic.