Follow these steps below to install MegaBuilder theme via WordPress:

Step 1. Visit Dashboard > Appearance > Themes > Add New.

Step 2. Click Upload Theme.

Step 3. Browse megabuilder.zip file on your computer and click Install Now.

Step 4. Activate MegaBuilder theme.

Step 5. Install and activate Thim Core plugin of MegaBuilder that required for importing demo data.