Before installing the theme, please unzip " themeforest-xxxxxx-jannal-windowscurtains-blinds-store-shopify-theme.zip" and upload the "jannal.zip " file to Shopify to avoid the "layout/theme.liquid" missing template error.
Theme Extractions
Download the package from Themeforest.net (it will be in ZIP format).
Find the file "themeforest-xxxxxx-jannal-windowscurtains-blinds-store-shopify-theme.zip" in your folder.
Extract the contents of the ZIP package you just downloaded.
Upload the "jannal.zip". file to your Shopify store.