Ordering any version of IoTool is quite simple.
To do so, simply go to https://manage.iotool.io and click Order IoTool.
Pick the IoTool version you want to buy. If you have decided to buy Professional or Enterprise version, you will have to pick the name of your server.
Enter a promo code if you have one and continue.
If you have already registered in the client area, you can login with the "Already Registered?" button.
If not, enter required personal and billing information. If you are from EU and buying as a legal entity, also enter your VAT ID.
Press "Complete Order" and all that is left is paying the invoice. Note that only PayPal is supported as a payment method.