Congratulations on receiving your SSD1331 device.
Believe me that seeing a few random lines and dots is better than starring at a black screen trying to figure out what may or may not be wrong.
There really isn't a SSD1331 "driver" to "install". If you are referring to my link in my post above, all you need to do is copy the ssd1331.py and balloon.bmp files onto your RPi. Then type: python ssd1331.py on the command prompt. This shall cycle through a demo/test.
May I ask how you have wired up your SSD1331 device to the GPIO? Are you using the same GPIO pins as I have used?