How can someone buy a $10,000 program without first using it long enough to know that it meets their needs?
Companies often provide evaluation versions that you can use for a limited time or with limited features.
Usually, if you're expert enough to need Protel or OrCAD, then you're probably generating enough revenue in your job to be able to afford it.
If you're just a hobbyist or enthusiast, then the less expensive or free packages are plenty adequate, such as Eagle, ExpressPCB, or PCB123.