I have acquired an old DVD titled Counter-Strike 1 Anthology that contains three games: Counter-Strike, Counter-Strike: Condition Zero and Condition Zero Deleted Scenes.
The DVD is released by Valve and has a serial code printed in it. However, there is nowhere to enter that code.
When installed on XP (that has no internet access), none of them starts. A simple error message display instantly:
Steam.exe (main exception): Unable to load library Steam.dll
If I install it a modern pc with internet, it instantly upgrades Steam to the latest. (And still cannot play because I should buy it first.)
How can I get those files (Steam 1.0.0.0 related dlls) from trustworthy sources? Googling it produces a miriad of files named steam.dll, wildly varying in size, version and date.
EDIT: I suppose that old Steam games were able to run offline. Can anybody comment on this?