Does not have valid header

This seems to be a temporary problem in the repository or in your hosting.

If the problem persists, try to download from here: https://www.ads-software.com/plugins/import-users-from-csv-with-meta/ and installing it in Plugins -> Add plugins and uploading a plugin from a file.

Thank you. Will let you know what happens.

Resolved on its own today. Thank you for your quick reply.

Great.