You can test Atom Logger on your own computers without any risk, given that every build provides you with the proper Cure Tool to kill/eliminate logger instances.
You can monitor as many computer as you wish as Atom Logger is sold with a lifetime license that doesn't limit the number of computers where you can install it.
As soon as your crypto payment receives one confirmation, you will also get an automated email containing your order details. There's no need to do anything more.
Should you have questions or issues, you're invited to contact me directly onsite with a private message or using the proper support section on my website. I don't use other communication methods and I always check all my messages/emails at the same time, so please don't send the same message over multiple channels.