Extension page:

https://www.opencart.com/index.php?route=marketplace/extension/info&extension_id=22276

Demo:

http://preorder.demo.isenselabs.com/index.php?route=product/product&path=24&product_id=28

Compatibility:

OpenCart – 2.x
BurnEngine minimum version – 1.0

Installation:

1) Extract the attached zip archive to a local folder.
2) Install the extracted tb_pre-order_iSense.ocmod.xml from Admin > Extensions > Extension Installer.
3) Refresh modifications from Admin > Extensions > Modifications.

https://i.imgur.com/goC8Sg1.png