Download failed. Forbidden

[Sakib3s]

I have provided a custom plugin with link ex: 'source' => 'https://example/example-plugin.zip', and that file is available on that path, tested the download link from the browser and it's downloading from the browser but in the recommended plugin instalation it shows this error:

Downloading installation package from https://themes.envytheme.com/tools/envy-demo-importer.zip…
Download failed. Forbidden

Would you please help me to find out the issue?