Check your configuration
Before buying, compare the product requirements with your computer. Confirm support for your game client and intended server if it is not explicitly listed. Mods and different client versions can affect compatibility; support for every configuration should not be assumed.
Use the guide for your product
The guide link sits next to the plan selector. Dullwave DayZ has a dedicated page with launch steps and original documentation. Do not mix instructions from different developers: loaders and menu keys can differ.
If launch stops
Record the exact error and the step where it appeared. Include the product, order number and Windows version in your support ticket. Remove keys and passwords from screenshots. Ask support for the next step instead of trying random loaders shared in unrelated chats.