FIX
I got hold of EA customer support and the second support analyst I spoke to helped me fix it. Thought I'd post it on here as I've only just got the game on DVD (Aug 2018) and had the same issues after trying to install it from disc - my install of Titanfall 1 got to the uncompressing of audio, got to around 36,000 out of 39,000 and failed with the following errors:
Titanfall Audio Installer Error / Titanfall Audio Installation Failed!
Error: A redistributable package (audio_installer.exe) was not installed successfully. Setup cannot continue.
....in relation to the following files on numerous installation attempts...
Client_mp_common.bsp.pak000_005.vpk
Client_mp_common.bsp.pak000_089.vpk
I could not uninstall Titanfall 1 as it hadn't fully installed, so no such option showed.
Here's a fix, as advised by EA (extra steps done by me are in orange).
1. Uninstall Origin (don't worry about your settings, games library etc, they're all in the cloud so will all return on reinstallation).
2a. (on step 5, I also deleted the Titanfall folder in LocalContent because when I followed this EA process first time, it failed).
2b. Don't reinstall Origin at this point.
3. Use Windows to search for all folders for Titanfall everywhere on your PC - delete any that are remaining (this won't work if you haven't indexed your hard drives so you'll have to search for them manually).
7. In Origin, download Titanfall again.
8. Fingers crossed, you'll have success!
n.b. If you have purchased it on DVD and use Origin, don't use the disks to install, just enter your license key in Origin and download the game instead as the problem files may have been rectified from ones that are on DVDs.