@Mods: Lazy Bastard allowed me to post this 
Feel free to move it if it should be somewhere else.
Note: This is for preservation purposes!
Below are 2 versions of GameShark for PC: v1 and v3.
To the best of my knowledge and from the research I've done, there was no v2 (though if you know of it, I'd love to be proven wrong).
Additionally, there's a zip file with the following:
-Update 1.21 for GameShark v1 and for Action Replay v1
-Pictures of the discs (taken from ebay)
-Manual for GameShark v3
The update, manual and codes took a long research with the WayBack Machine.
Not sure if there were other files I never found.
Also, not sure if the codes files work for both versions or not, you'll have to try it (I don't have the means to try them for now).
GameShark 1.0
GameShark 3.0
updates, manual and pictures
extra codes (all files I could recover via the WayBack machine; there may be some duplicates):
PS: some of the pictures shown in the wiki:
https://gamehacking.org/wiki/GameShark_(Windows_PC)
are for the GameBoy GameShark, not the PC ones; not sure who can fix this.

Feel free to move it if it should be somewhere else.
Note: This is for preservation purposes!
Below are 2 versions of GameShark for PC: v1 and v3.
To the best of my knowledge and from the research I've done, there was no v2 (though if you know of it, I'd love to be proven wrong).
Additionally, there's a zip file with the following:
-Update 1.21 for GameShark v1 and for Action Replay v1
-Pictures of the discs (taken from ebay)
-Manual for GameShark v3
The update, manual and codes took a long research with the WayBack Machine.
Not sure if there were other files I never found.
Also, not sure if the codes files work for both versions or not, you'll have to try it (I don't have the means to try them for now).
GameShark 1.0
Code:
https://mega.nz/#!U5hzDCSS!U--Xa5wYEwljCFqAvfLz3Av5B5Szz-E11IZm_JYiKds
Code:
https://mega.nz/#!otIWGYwC!I52YqHhmQL7_ebecr3zZ5dQgbmybir-P8gARx3H7enM
Code:
https://mega.nz/#!N0RARDpZ!fzNvAf2w0s7p68hs7D0u4hgvXe_uMTIaGjkTp7GQhg4
Code:
https://mega.nz/#!VlIHQJTI!b2uxz7whgnr-E5JVxpcs54291KN0Xjq2-Cckf5n-W_U
PS: some of the pictures shown in the wiki:
https://gamehacking.org/wiki/GameShark_(Windows_PC)
are for the GameBoy GameShark, not the PC ones; not sure who can fix this.