Follow these steps to upload your theme in Prestashop:
STEP 1: Copy the ‘Theme’ Folder from the Exported folder and Paste it at Prestashop (Root) -> Themes -> Paste your Theme here. Then Log In to your dashboard.
STEP 2: Then from Backoffice Go to Preferences -> Themes -> Add New Theme -> Create New Theme.
a) Preference -> Themes
b) Preference -> Themes -> Add New Theme
c) Preference -> Themes -> Add New Theme -> Create New Theme
STEP 3: Fill the required Fields, Theme and Directory Name should be the same as the name of the exported theme. Make sure to select the preview image from the exported theme. Select the Default Left, Right Sidebars, if you want them in the Theme.
STEP 4: To upload Module from Prestashop Backend Go to Modules -> Modules and Services -> Add New Module -> Upload the module zip file placed in the modules folder.
a) Modules -> Modules and Services
b) Modules -> Modules and Services -> Add New Module
c) Modules -> Modules and Services -> Add New Module -> Upload the module zip file placed in modules folder.
STEP 5: Copy and merge the Override folder given at root folder.
STEP 6: Move all of the JavaScripts to End. To do this Go to Prestashop Backoffice -> Advanced Parameters -> Performance -> CCC (Combine, Compress and Cache) -> Move JavaScript to the end -> Yes.