I'm not a Windows Insider and my update was fine. I found this page which will allow you to download just that driver
It is the 6th one down on the page (22.20.16.1749). Interestingly there are newer versions, but this is the one that came with the 1803 update.
This is assuming that it was the graphics driver that fixed the issue vs something else. You may still want to figure out why your 1803 was not updated in the same way. Let us know how you get on. I feel a sense of responsibility and guilt knowing mine is working and yours should. ;-)
I also have build 17134.48 so not sure why I dont have the same graphics driver.
also, just to clarify, you mean 22.20.16.4749 not 1749 (I think you had a typo in your last post)>
I'm downloading now and will try to update and see what happens. thanks!
Sorry, but how do I install the file downloaded from here:
On another note, I updated the driver using a file I had previously downloaded, driver 22.20.16.4771 dated 8/13/2017. It fixes the Illustrator GPU issue, but monitor has flickered a few times.