the first time that i've tried to install lightroom it asked for my apple id password but it also kept saying that it wasn't corect. Now if I press on "download" from the website the next page results as "error 500" like if it has something to do with their servers. i'm new here so if anyone can help me out would be awewsome.
When you are installing or updating on a Mac, that is your Mac asking you to prove that you have permission by asking for your COMPUTER password, not your Adobe password... and nobody here can help with an Apple password
It is more than likely asking for your Computers Login password. The password you use every time you start your Mac. It is askig for that so it can Write the LR files to the drive. This is completely normal every time you install a program on a Mac.