- Start by logging into Themeforest with the account that you’ve used to purchase your theme.
 - Click Downloads and re-download the theme you’ve purchased. You will automatically get the newest version.
 
When downloading the theme files from ThemeForest, make sure to download the 
– Installable WordPress file only
OR
– if you’ve downloaded All files & documentation, extract the zip file and find marni.zip.
- Go to your WordPress admin and click Appearance → Themes
 - Click Add New Theme
 - Click Upload Theme and upload marni.zip