It has been a while since I did this install, so my memory may not be correct, but the installer program should ask you if you want to save the temporary files to a specific folder location, and the error mssage is telling you that the folder location doesn't exist, or the folder location doesn't have WRITE permission. So if you re-start the installer, choose a different folder location that doesn't have this problem, or chnage the permissions to WRITE.
it is not asking for anything - I only have the option to click download. but it is not happening. I have installed the Photoshop in the same way.. nothing went wrong but light room is not working?
Did you fix it? I am getting the same error. Thank you