I've been trying to find beta, alpha, retail builds l4d all over the internet. I finally found after a really huge amount of time, but it's created by fans. But I'm even so surprised, because there's even a terror strike video.
I want to spread this so more people will know about it, for it helped me to understand the roots of l4d!
https://drive.google.com/file/d/1ElCB77NhVJj-OShY-fkOcfq-Bkfe9Pvo/edit terror hl1 modification (fixed, credits : epic player and Cryptical) there is also a file here .fgd, from which data from updated developer builds is leaking
https://mega.nz/file/2ChEyTrJ#rdWdvSYhKHLGz2ZiM7cV6M_y5nF4eBxWedLxCr_0aQM (my reupload) An old version of the terror modification on hl1 (leaked terror strike dlls & some patches. map & sounds added by epicplayer40, rest is untouched) they're unstable(crashing)
and video!!!!!!!!
https://mega.nz/file/nbICgYaR#NMRfPNuLRZe6cl3xZrKRexqici74IrI1Hhx3xl4fdnU video reupload, if it will be deleted
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https://github.com/billysb/cscommunity it remakes this footage ^ | drop in sourcemods (I don't know if you need to install css in your steam) it has a discord too
https://discord.gg/AeS2WTRcfv+link to valve archive
https://discord.gg/aUkqkNZw (more l4d leaks on board!!) below are a few photos from this source
I downloaded all the images from there and put them in a zip archive,
if you don't want to go to the discord channel, or if it will be closed, you can try to download from here (my reupload)
https://mega.nz/file/vbZxgaBY#2V4Lb9404PX949Ubw04U3nu6__QXNnAfqhzfRuwFfoIthese are just a few! there's more in the source! i just don't want to clutter up the thread with it.... there's also prototypes of some characters I didn't see in the 2018 leak(if my memory serves me right). I'm sorry if these pictures have already been seen, I just haven't seen them before.
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I repeat here also rare links:
Oct 2008 build of L4D
https://mega.nz/file/CQhhzR5Q#Ays8U40foGEYeEq5AfKwL5JORcAMFpejB0OOp0-VMW8 ("can be run with either smart steam emu or via steam so long as you own the game")
I would also like to add l4d2 retail
https://archive.org/details/left4dead2retail If you have a l4d2 licence in steam, it will actually open it without any problems, only you won't be able to join games, it will just be a single player game.
(l4d2 retail video