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.
Step 1: You need to deactivate the current Conebrick theme in Appearance> Themes section by simply activating a different theme. Once you activate a different theme, you can delete the Conebrick.
Step 2: Retrieve the tm_conebrick.zip file from your new Themeforest download. If you download All files & documentation, then you need to unzip the archive file you received, the conebrick.zip file will be inside of it.
Step 3: Then simply upload and activate the Conebrick file in the Appearance > Themes section like you've done when installing theme.
Step 1: Go to wp-content >> themes location and backup your BuildPlus 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_Buildplus.zip file from your new Themeforest download and extract the file to get the tm-BuildPlus theme folder.
Step 3: Then simply drag and drop or hit Upload the new “BuildPlus” into wp-content > themesup 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.