Can anyone help me find the link to download ArcGIS Engine 10? I have tried to find it, but unfortunately I have not found it.
you need to buy it, get a login, then login, then there's a download option inside the portal.
The ArcGIS Engine software development toolkit is included for no extra charge as part of your annual subscription to the Esri Developer Network (EDN). Once you subscribe to EDN, you can download all of the software included with the bundle, including ArcGIS Engine through the Esri Customer Care Portal here: http://customers.esri.com/
For more information: http://www.esri.com/edn
If you're not an existing customer, you won't be able to download it (you need a portal login for that). If you contact your local ESRI rep however, they'll post you out a DVD for evaluation.