Via [url=https://steamcommunity.com/games/TF2/announcements/detail/3972804306501016271]the Steam Community[/url]:

[quote=Valve]- Fixed a server crash related to PASS Time and the round timer at the end of a round
- Fixed overlapping texture for the Panic Attack's kill icon
- Updated the Winning Spirit Unusual effect to fix problems with clipping and the control points

- Updated cp_brew
- Fixed missing textures on a truck
- Fixed unintended sentry spot on top of the HVAC pipes at the Brewery

- Updated pl_camber
- Fixed respawn room exploit

- Updated plr_hacksaw
- Fixed teleporters being able to be placed in spawn
- Removed hint nodes from the hacking sequence

- Updated plr_hacksaw_event
- Fixed teleporters being able to be placed in spawn
- Updated to match layout changes to plr_hacksaw

- Updated ctf_pelican_peak
- Removed skybox bridge for dx8 users
- Adjusted cow
- Miscellaneous fixes

- Updated pl_corruption
- Fixed an issue with the 3D skybox[/quote]

Rumor has it:

- Size is ~160 MB

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[b]Valve's support of Steam on Windows 7 and Windows 8.1 [url=https://help.steampowered.com/en/faqs/view/4784-4F2B-1321-800A]has ended on 1/1/24[/url].[/b] Any future TF2 updates that moves the minimum Steam client version beyond the last one available for 7/8.1 will render it unplayable unless you upgrade Windows.