Gamepad to usb adapters?

https://www.google.com search for a driver shows the following free download. Since you didn't state which version of Windows you have, it is unknown if it will work for you.

https://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Joystick-Xterminator-Dual-Control-10.shtml#download

http://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Gamepad-Pro-10.shtml
THE ABOVE LINK WILL HELP YOU.
REGARDS.
PLZ. DON'T FORGET TO RATE THIS COMMENT.

Hi fugaslic,

You may download your driver software, click this link http://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Joystick-BlackHawk-Digital-10.shtml.

After download completed run the set-up, then follow the wizard.

Hope I helped you.

Have a nice day!

Thanks for using Fixya.

Follow the below guide from Logitech.....

The following Logitech gaming devices will function on a Macintosh computer running Mac OS 9 with Input Sprockets 1.7 or higher. You must also have a functioning USB port.
Logitech® Freedom™ 2.4
Logitech® Dual Action™ Gamepad
Logitech® Extreme™ 3D Pro
Logitech® Attack™ 3
WingMan® Attack™ 2 on the USB port
WingMan® ActionPad™
WingMan® Formula™ GP on the USB port
WingMan® Precision GamePad (USB version only)
WingMan® Extreme™ Digital 3D
WingMan® Formula™ USB
WingMan® GamePad USB
These devices will use the Mac OS Human Interface Device (HID) support. If you are experiencing detection problems using one of the supported devices on a Mac, please contact Apple to ensure your computer meets these requirements. If you are experiencing problems in a particular game, please contact the game manufacturer.
To determine if your Logitech game controller is detected please do the following:

1. OS 9.x
   
2. Click the "Apple Menu".
3. Click "System Profiler".
4. Click the "Devices and volumes" tab.
5. Look at the USB tree to confirm that the controller is listed.

1. OS 10.x (Traditional View)
   
2. Double click the "Hard Drive" icon.
3. Double click the "Applications" folder.
4. Double click the "Utilities" folder.
5. Double click "System Profiler".
6. Click the "Devices and volumes" tab.
7. Look at the USB tree to confirm that the controller is listed.

http://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Joystick-Xterminator-Dual-Control-10.shtml

I have encountered a similar issue before. What works, is to try the update of your chipset's driver. This could be an error once present in your chipset's initial release, but has since then been fixed by your chipset's manufacturer. Also this could another among the millions of peculiarities in the windows operating system, i say this for it is very possible the the controller will function well if a game is started while the controller is already plugged in. Just see if it works, but an amendment to the chipset's instruction set would be optimal.

http://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Joystick-BlackHawk-Digital-10.shtm

Please visit to this site

Then you can download your drivers

Here is the driver. I couldnt find any other software for gravis gp pro, at least the driver should make it work.

regards

Logitech does not provide any gaming software for the Mac platform. However, Logitech gaming devices are supported natively in Mac OSX. This means you can still use your Logitech gaming device, provided that the game you are playing supports a gamepad, joystick, etc.
If you are using a gamepad, and you'd like more programmability, you can use third party software such as Gamepad Companion. Keep in mind that this is third party software and you should contact the manufacturer of the software should you have any issues or questions about using the software.


Please read THIS and THIS as well.

see if this is what you need - http://drivers.softpedia.com/get/JOYSTICK-GAMEPAD-WHEELS-and-TABLETS/OTHERS/Gravis-Gamepad-Pro-10.shtml