In my experience managing local LAN environments, I have found that installing StarCraft 2 without an active internet connection can be a challenge due to the installer's default reliance on Battle.net. To be clear: this process does not circumvent account authentication, nor does it bypass the need for a legitimate game license or a Battle.net emulator for actual gameplay. This is strictly a method to facilitate the initial installation of the game files when an internet connection is unavailable.
Official Authentication Codes:
These codes are sourced directly from Blizzard's static media keys, which are intended to allow the installer to proceed when the primary authentication server is unreachable.
https://eu.battle.net/static/mediakey/sc2-authenticationcode-enGB.txt
G8MN8UDG6NA2ANGY6A3DNY82HRGF29ZH
https://eu.battle.net/static/mediakey/sc2-authenticationcode-itIT.txt
NE7CUNNNTVAPXV7E3G2BSVBWGVMW8BL2
https://eu.battle.net/static/mediakey/sc2-authenticationcode-frFR.txt
ZG7J9K938HJEFWPQUA768MA2PFER6EAJ
https://eu.battle.net/static/mediakey/sc2-authenticationcode-esES.txt
8WLKUAXE94PFQU4Y249PAZ24N4R4XKTQ
https://eu.battle.net/static/mediakey/sc2-authenticationcode-plPL.txt
2NSFB8MELULJ83U6YHA3UP6K4MQD48L6
https://eu.battle.net/static/mediakey/sc2-authenticationcode-deDE.txt
Y45MD3CAK4KXSSXHYD9VY64Z8EKJ4XFX
https://eu.battle.net/static/mediakey/sc2-authenticationcode-enSG.txt
W9RRHLB2FDU9WW5B3ECEBLRSFWZSF7HW
https://eu.battle.net/static/mediakey/sc2-authenticationcode-zhTW.txt
U3NFQJV4M6GC7KBN9XQJ3BRDN3PLD9NE
https://us.battle.net/static/mediakey/sc2-authenticationcode-enUS.txt
3DH5RE5NVM5GTFD85LXGWT6FK859ETR5 (Courtesy of www.SceneSite.net)
Technical Procedure:
1. Launch the StarCraft 2 installer.
2. Click "Install." You will likely encounter an "Unable To Connect" error due to the lack of internet access. This is expected behavior.
3. Observe the yellow warning icon at the bottom of the installer window. Click this icon to trigger the "Authentication Code" prompt.
4. Select the code corresponding to your specific game region (e.g., I used "G8MN8UDG6NA2ANGY6A3DNY82HRGF29ZH" for the en-GB version). Paste this into the dialog box and click "Ok."
5. The installation process should now proceed as normal. I recommend keeping a record of your specific regional code for future offline installations.
Important Note: These keys are strictly region-specific. Attempting to use a key from a different region will result in an error, as the installer validates the key against the regional data files.


