You need to pay a license fee If you are using ConstEdit for business purposes, i.e. if you are using ConstEdit to try to make a profit. For non-business purposes, you are allowed to use the software for free. 

The license fee for using ConstEdit for business purposes is US$50 per computer. The license is lifetime and you are entitled to all future updates, free of charge. All payments are not refundable in any cases.

Your purchase is safe and secured by PayPal. You can specify the required number of licenses through the PayPal payment page.