How to upload the file.sagews to the local installed Sage

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The .sagews file format is specific to SageMathCloud.

To use them locally, you would have to run a local SageMathCloud instance, which can be done using Docker. Read more here: https://github.com/sagemathinc/smc/blob/master/src/dev/docker/README.md

The other option is to convert your .sagews files to .ipynb files using sagews2ipynb, and you can then use the resulting Jupyter notebook worksheets (.ipynb) with your local sage installation, by running sage -n jupyter.