I bought the ultimate before-after image slider for wordpress from envato today. It does not work, the website links to a chinese page, not readable, and envato does not support this plugin. there is no autor to contact. This is fraud and envato supports this with the sale. This is how you do business and fool the customers.
I found this:
ForeverThemes does not currently provide support for this item
so, before purchase customer should to check the item support availability.
You can request a refund. Not sure if you’d get one but you can try