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Enter the full path to your Baldur's Gate installation
then press Enter.
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C:\Program Files\Black Isle\Baldur's Gate\
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Invalid Baldur's Gate directory, or
incorrect Baldur's Gate installation.
It is safe to abort this installation by closing this window, or
pressing Ctrl+Break three times.
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Undetectable Windows version. Possibly too new. Installation MAY fail.
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Enter the full path to your Baldur's Gate installation
then press Enter.
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I tried adding the Data files of the DVD (I use a recent reedition) in the folder, I tried putting the folder in a folder with a simpler path, but so far, nothing has worked.
Currently installed are the 4 DVDs of the pack (BGI, TotSC, BGII and Throne of Baal), and the most recent official patches.