Where can I download this software from?
Try here https://download.epson-biz.com/modules/pos/index.php?page=soft&scat=44 or go back to the software download page and click download. I've uploaded a new link to the Official site of Epson™ Printers.
This application is hardware dependent which means it's available only for a certain number of models and versions. To check for your device, access the Business website. If you want a Label Editor that works for multiple products, then use Epson Label Editor Software or use Epson Support and look for the model of your device.