Your question seems to have slipped to the bottom of the page unanswered, but you need to put way more information in your post to get it answered.
I believe 49 is a general error code similar to the U44M1P7 error we see a lot of people mention.
What is your situation now? Have you still not been able to install Photoshop, or is it an update you are having problems with?
What version of Photoshop?
What operating system?