What is the price of enterprise edition please. Can it be one time purchase.

Hello Umer,

You can choose from different enterprise plans, depending on your organisation's needs. The best way to get an overview is to visit the pricing page: https://www.openproject.org/pricing/

This includes a table that lets you compare the different available tiers (Basic, Professional, Premium and Corporate).

https://www.openproject.org/pricing/#features

Best
Alexander