If you run into errors when you're trying to install AdBlock from the Chrome Web Store, you can try "sideloading" it instead.
Sideloaded extensions won't receive automatic updates.
How to sideload AdBlock for Chrome
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Download the zip file for the most recent release of AdBlock and extract it to a location you can find easily.
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Type chrome://extensions in the address bar to open Chrome's Extensions page.
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Enable Developer mode in the upper right corner of the page.
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Click Load unpacked extension, browse to the location where you downloaded the file, and select the extracted folder.
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Click Add extension when Chrome prompts you.