Upon solving T1A the password page was replaced to instead have an image of THE_FINALS_Promo_OSPUZE_Weapons_1920x1080.png.
A higher resolution copy of the image was posted to the brand new official-art channel when it was
made two weeks later:

1) Pigpen cipher

With some light photo editing a hidden pigpen cipher was found in the image (credit).
The characters for the cipher were quickly identified. Here I’ve isolated only the cipher:

The Wiki page for the pigpen cipher has an image which explains everything you need to know to solve this cipher:
pig_pen_cipher | 300
Start with the left most character of the cipher which looks like a blocky capital C. See how the grid outline around the letter “F” in the Wikipedia image match that part of the cipher? That’s all there is to it!
For cipher characters that have double lines use the upper right key from the wiki page. Instead of using dots, Rob’s pigpen cipher uses double lines! Do this for the whole cipher and you’ll quickly get the answer:

FKRAMER

This was quickly found to be a reference to Frank Kramer, the credited name of director Gianfranco Parolini.

2) mmisar X

Around the same time Gianfranco Parolini was mentioned the text “mmisar X” was found on the M60. The beginning of the text was occluded by the bullet feed, however the recently solved pigpen clue pointing Frank Kramer helped immediately discover that this text was referring to a film he directed named Kommissar X.

3) 1962num1962

Several of the bullets feeding into the M60 and falling out of its feed bag have grey dots in the center of the primer on the base of the casing. (credit)

By counting the contiguous sequences of bullets with grey dots you get the number 1962. (credit)

This was immediately linked to the films Gianfranco Parolini released in 1962, including 79 A.D.

4) X

On the Ospuze sheriff badge strapped to the forestock of the M60 there is a letter “X”. The presence of the “X” led hunters to consider it as a Roman Numeral 10, potentially connecting to Gianfranco Parolini’s film The Ten Gladiators

5) 832num832

The presence of 8 bullets strapped to the M11 alongside the number “32” stamped into the gun pointed toward “Ab urbe condita 832” - a representation of the year AD 79 in a different calendar system.
Looking at the AD 79 Wikipedia page the roman numeral password is present between AD 79 and Ab urb condita 832.