Style Sheet is missing

I have just taken over a website and just updated everything =- plugins, wordpress and the themes. The theme being used was Themia-lite and it now does not work. It says that the stylesheet is missing. It initially would not update from within wordpress dashboard, and gave the message that it was broken.

I have then downloaded it from this site, uploaded the zip file and it says that the stylesheet is missing.
The following themes are installed but incomplete. Themes must have a stylesheet and a template.

Name Description
themia-lite Stylesheet is missing.

If I upload the theme from a zip file I get the following error message:
Unpacking the package…

Installing the theme…

Destination folder already exists. /content/shard2/Hosting/b/a/baytreetherapycentre.co.uk/web/wp-content/themes/themia-lite/

Theme install failed.

I have uploaded the theme successfully to another site just to test and it went without any errors so the problem doesn’t seem to be with the theme itself.

Any ideas?

Thank you
Lynden