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Laporkan kesalahan penerjemahan
Steam Store don't contain Half Life 2 Game of The Year Edition at all.
go buy the game from Steam Store directly.
https://store.steampowered.com/app/240/CounterStrike_Source/
Get a refund.
Invalid means that Steam does not know that key at all.
What publisher is listed on the box?
2. There no brand new copies they been out of print for over a decade, so if you bought it used off someone, you should've realized the key very likely to be used already, that why don't buy used copies of games with keys.
3. If already own half life 2 you don't get another copy.
since Half Life 2 GOTY also contains Counter Strike: Source too.
what OP didn't know is this post which i stated earlier in the thread which i'm quoting below
---------------------------------------------------------------
OP should have gone to Steam Store directly and Search for Counter Strike: Source
instead of going somewhere else and buy 2nd hand games that doesn't work anymore on Steam Platform.
Valve never did the retail publishing for any of their games.
the publisher for Half Life 2 GOTY is Electronic Arts aka EA.