Extract that codecanyon downloaded zip in your local PC. There are 3 items inside it.
1. portfolio-designer-document.zip
2. portfolio-designer.zip
3. Licensing
Step 2. Login into your WordPress admin area and click on the left side plugin menu.
Step 3. Now at top of the page, you can see Add New button, click on that button.
Step 4. Again at top of the page, you can see/view Upload Plugin button, click on that button for next process.
Step 5. Now upload the plugin zip file (portfolio-designer.zip) via drag and drop or direct file upload selection. After file selection and click on Install Now button.
Step 6. And then click on Activate Plugin link.
Installation via FTP
Step 1. Extract the above-selected zip file (portfolio-designer.zip). It will create a ‘portfolio-designer’ folder with all plugin files & folder inside it. (Remember this extracted folder path)
Step 2. Using your FTP programs like Filezilla or cPanel, upload the non-zipped plugin folder into the /wp-content/plugins/ folder on your server.
Step 3. Go to Dashboard » Plugins » Installed Plugins page and find ‘Portfolio Designer‘ from the plugin list.
Step 4. Click on Activate to activate Portfolio Designer plugin.
Still you not get the solution for your query? open a support ticket.