One of the reasons you may receive this error is if you have uploaded the incorrect file. You have two options for downloading your theme.
- ‘All files & documentation’ (full zip folder). You will need to extract and locate the installable WordPress file.
- ‘Installable WordPress file only’.
Please make sure you are uploading only the installable theme which is called NameOf Theme.zip. If you upload ALL these files you will receive an error.