Login to your WordPress admin and navigate Appearance >> Themes.
Step 1- Select the Add New tab at the top, then click Upload Theme.
Step 2- After you click the Upload link, a new page will open where you will be asked to find the .zip file you downloaded after purchasing.
Step 3- Select that file and click Install Now.

Step 4- When it has finished uploading, activate the Ascend Premium theme.

Upgrading -Free to Premium
Update Your Menu Location Assignments
- Step 1 – Navigate to Appearance > Menus.
- Step 2 – Choose a menu and assign it to the appropriate location in the theme.

Update Your Widget Assignments
- Step 1 – Navigate to Appearance >> Widgets.
- Step 2 – Click and drag each widget back to the desired location (when switching themes widgets may switch widget areas or be placed in the “inactive” widget area).