If you're asked to provide a DXDiag (Windows) or System Information (macOS) report as an attachment to a Helpdesk ticket, this is how to generate that file we require.
First, we'll cover Windows users, but scroll down to find macOS instructions also.
On Windows 8 and 10, right-click your Start button and choose Run. Alternatively (or if Windows 7), press and hold your Windows key on your keyboard, then press R.
That will give you the Run dialogue. Type in "dxdiag" as shown below, then click the OK button.
When the DirectX Diagnostic Tool opens, it will start a progress bar to the left of the window. Allow this to finish, then click Save All Information.
It will ask you to create a new text file to save the logged information. Leave the name as DxDiag, but take note of where the file is to be saved, then click the Save button.
Now return to your web browser and your helpdesk ticket, then drag the text file from wherever it was saved and onto the body of the ticket. This will attach the file to the ticket ready to send back to us.
If your issue is that GameMaker or games crash or won't start, at this point, open the DXDiag report yourself and scroll to the very bottom. Often, the last 10 or so application crashes will be listed in this file (and this is part of the information we're looking for). Reading the error message written here will often give vital information as to what caused the crash - try Googling the error message if the information doesn't immediately suggest a fix to you.
Whether you manage to fix the issue by reading the crash report or not, send us back the DXDiag and any updated information in the ticket (obviously, do also let us know if you fixed the issue yourself).
System Information (macOS)
Click the Apple menu on your menubar, then "About this Mac". This will open the Overview for your Mac.
Click the System Report button as shown, and this will open a new app which gives you detailed information about your system.
You will see that your menubar has now changed to be System Information, and if you now open the File menu, then you will have an open to save a report.
It will ask you where to save the logged information. Leave the name as the default (which should be the model of Mac you're using), but take note of where the file is to be saved, then click the Save button.
Now return to your web browser and your helpdesk ticket, then drag the file from wherever it was saved and onto the body of the ticket. This will attach the file to the ticket ready to send back to us. Add the rest of your response and then submit the ticket back to us, and then we'll get the file. Thanks!
More information can be found at https://support.apple.com/en-gb/HT203001