If I use 2 account, 1 for dlc downloading and 1 for modding and having fun. Will they both get ...

Ok his console is console.1

His account is account 1

Your console is console 2

Your profile is account 2

So account 2 buys the membership

And downloads the profile on both console 1 and 2

But makes console 1 home console

Account 2 downloads the game on both console 1-2

Now account 2 has to be signed in on console 2 online but can play offline on console 1 since its home conskle.

Accoint 1 can only use the game on console 1 but not console 2

Account 1 has to rely on account 2 to download gamepass games

Ok first to explain it

Lets call the primary account account 1 with gold and games and dlc

And the second account account 2 that wants to play coop etc whatever

Console 1 is the home console

And console 2 is visiting console

Console 1 Account 1 makes console 1 home and both account 1 -2 can use dlc and gamea and gold on console.1

On console 2

Account 1 must sign into live to use dlc and games at all times

Account 2 does NOT have gold on console 2 as ita on console 1 you have a limit of 10 switches per year gamepass isnt shared only the gold part of ultimate is with one gold only one can be roaming

Keep in mind an profile can only signed in on one place at a time so there Must be two profiles for them to play together

There is a way to use it on both consoles, but it may be a little more difficult.

When you purchase content it's tied to the gamertag that purchased it as well as the console that it was purchased on. So let's say Gamertag 1 downloads some DLC on Console 1. That gamertag and all of the other gamertags on that console will have access
to the DLC because both of the licenses are there. If Gamertag 1 moves to Console 2, it will be able to redownload and access the DLC as long as it's signed into Live, but only Gamertag 1 would have access to the content because the console license is still
on Console 1.

I had the issue where Pt. 2 was corrupt, but would not re-download (jumping from 1% to 99%). I tried capricaswiss' solution of moving the intact file to a flash drive, and that allowed me to re-download part 2. Then I went ahead and re-downloaded part 1
for good measure.

I think the problem is that the marketplace shows Citadel DLC Part 1 and Part 2, but the actual file names appear to both be "Citadel DLC Part 1". So, if either one becomes corrupted, your system thinks you are downloading Part 1, and you already have it.

LEFT FOR DEAD 1 and 2 if they do not have it. You can get both them cheep. And they are fun too.