Lookbook is cannot be activated.

I have bought the license for the premium version of woocommerce lookbook.
All of the downloaded files were included in the zip file.
Then, I uploaded manually that zip file into “upload plugin feature”. It failed.
The plugin could not be activated because it caused an unrecoverable error.
Parse error: syntax error, unexpected ’?’ in /home/ebrdefne/public_html/wp-content/plugins/woocommerce-lookbook/includes/instagram.php on line 78
There is a code error, therefore the plugin cannot be activated.
I’d appreciate it if you could make it work smoothly.