The theme is missing the style.css stylesheet

Couple of months before i have purchased the lifetime access to athemes themes. the very first template i downloaded is astrid pro and faced this common issue that the css style sheet file is missing. (perhaps, might be i am unlucky in this case) Anyways i have enclosed the screenshot, please review and help/assist to solve this issue as early as possible.

Hello, Astrid Pro is a plugin. Please install it as a plugin.

Please feel free to ask any other questions that you might have.

Kind Regards, Roman.
aThemes Support

Thank you for the quick response. Also please guide from where I can download this plugin. I have directly installed the pro theme which is unable to upload. Should I download the simple Astrid theme? Also, is possible to download the plugin from the dashboard/add plugins option?

Also please guide from where I can download this plugin.

You can download it here in MY ACCOUNT → DOWNLOADS tab.

Should I download the simple Astrid theme?

Yes, you can do it directly in your Appearance → Themes → Add New section.

Please let me know if you need more help.

Kind Regards, Roman.
aThemes Support