First of all, make a folder on your RGH called "GTAV" (or whatever you want) Once you have made a folder for the 2 GTA discs, make 2 folders. Disc 1 and Disc 2.

Extract disc 1 into your Disc 1 folder and do the same for Disc 2.

Like this (picture example)

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Now, after you have installed both discs into their correct folders you will need to add the title updates (TU)

The TU file goes in the following location on your console. You may have to create this folder if it doesnt already exist. Be sure the folder path and folder names are exactly as shown here!
Hdd:/Content/0000000000000000/545408A7/000B0000/

Need help? Open the spoiler for a picture of what to do

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Now, on to adding compatibility Packs, DLC, and Collectors Edition files.

Download and copy all of these additional files to the following location on your console. You may have to create this folder if it doesnt already exist. Be sure the folder path and folder names are exactly as follows!
Hdd:/Content/0000000000000000/545408A7/00000002

Picture for help

Additional files if needed: (these aren't xex's) [ Register or Signin to view external links. ]

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Video guide if needed: