Update Theme

Firstly, you need to download the new theme package from your Themeforest account. Once you have the new theme package, you can choose to upload the theme via WordPress or via FTP.

Update theme via WordPress

Step 1: You need to deactivate the current Polygon theme in Appearance > Themes section by simply activating a different theme. Once you activate a different theme, you can delete the Polygon.

Step 2: Retrieve the tm_polygon.zip file from your new Themeforest download. If you download All files & documentation, then you need to unzip the archive file you received, the tm_polygon.zip file will be inside of it.

Step 3: Then simply upload and activate the Polygon file in the Appearance > Themes section like you've done when installing theme.

Update your theme via FTP

Step 1: Go to wp-content >> themes location and backup your Polygon theme folder by saving it to your computer, or you can choose to simply delete it. Your content will not be lost.

Step 2: Retrieve the tm-polygon.zip file from your new Themeforest download and extract the file to get the tm-polygon theme folder.

Step 3: Then simply drag and drop or hit Upload the new “Polygon” theme folder into wp-content > themes location. Choose to Replace the current one if you did not delete it.

Step 4: Lastly, update the included plugins. You will see a notification message letting you know the plugins have a new version and need to be updated. You should update the plugins. You can see Update Plugin for more details

Step 5: Please go to Appearance >> Customize on admin sidebar and hit Save & Publish