Missing template "layout/theme.liquid"

• When I upload the zip file to Shopify I get an error saying "zip does not contain a valid theme: missing template "layout/theme.liquid".

• The package you received from Themeforest has the following items: file, documentation, log.txt, readme

• Please Extract the whole package after downloading it from Themeforest. themeforest-xxxxx-puresip-juice-health-drinks-shopify-theme.zip,

• You files like puresip-demo01.zip, puresip-demo02.zip and puresip-demo03.zip [Select the suitable package to upload.] , Log.txt and Readme.txt.

• You need to install the file "puresip-demo01.zip, puresip-demo02.zip and puresip-demo03.zip [Select the suitable package to upload.]" in the shopify store