Okay, it seems like problems are cropping up faster than we can give advice about how to solve them. So here is a little help, gathered in one thread.
First off the bat - a bit of forum culture. If you have a problem, don't crash into the first you see and post. Look for a similar thread. And if there is not one a similar thread, post a new one. But do try and keep it tidy. If you want help, make it easy for those that want to help, to find your question. And have a bit of patience. The patch has been out for a day and a half.
These 6 hints should take care of most of the problems we have seen during the last 36 hours. Use them, and lets make a bit of room for those that installed the patch correctly, and still have serious problems.
Thank you.
Now, back to business.
1) From the readme.txt:
Unzip the file named "GP4_patch v9.6.zip" [to a temp folder] and run "Setup.exe. "Setup.exe" will install the patch over the game."That means that if you copied the files into your GP4 folder, then you are gonna have problems. Make sure that you installed the patch correctly!
2) Also From the readme.txt:
If you already got the old patch V4.0 on your computer, you need to uninstall the game and reinstall it to be able to install this new patch.That means that if you got the crappy withdrawn patch, then they are incompatible. Repeat patch 4.0 and 9.6 don't work with each other!
3) If you have a modded game, then chances are that the patch will give you problems. Mods are 3rd party files. That means that IG, Geoff and Simergy have no connection to these mods, and that they take no responsability for them. That also means that they have no obligation to make sure that a patch will work with these files. If you decide to install the patch on a modded game, then YOU decided to take the gamble that it would work. If it doesn't work after the patch, then it is YOUR fault.
4) If you are getting the "No Error" problem, then GP4 is trying to use files from the old file format. As far as we know, the new patch introduces new file formats for f1graphics.cfg, controller files, save games and setups (not confirmed yet though). Please take notes on what you wish to keep from these files, and redo them manually when the patch has been applied.
5) Your controller doesn't support split axis anymore. Well, my controller uses split axis with no problems at all. My guess is that ppl have forgot how to set up the split controller axis in GP4, and/or using controller files with the old file format. The GP4 FAQ on the official homepage [can be found in the popup] has a step by step guide with screenshots on how to set it up properly. It took me 5 minutes to redo my controller file. Try it. It might actually work.
6) The best way to install the patch is to completely uninstall GP4, and then to reinstall it, and apply the patch. If you are having trouble, please try this [take backups!]. And make sure that the old folder and the all registry keys are deleted.
It's only after we've lost everything, that we are free to do anything.