Download Instructions for Complete and Online Editions:
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Ensure that all non-E3 mods are disabled prior to adding the Beta Pack to your addons folder. The content is heavily scripted so most gameplay functions are within their E3 limitations.
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Go to Left 4 Dead 2 in your Steam Library
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Click Settings
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Click Properties
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Click Local Files
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Click Browse
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Go into left4dead2/addons
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Drag the l4d2betapackv.vpk file into your Left 4 Dead 2 Addons folder.
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Enhanced Folder Installation Instructions:
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The Enhanced folder consists of more E3-related content that cannot be activated by a simple VPK replacement. It can be opened using the external program GCFScape.
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Open the Betapack.vpk using GCFScape.
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Drag the folders to a safe destination.
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Open the Enhanced Folder.
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Follow the readme prompts for further guidance.