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1. Download the required extension package, get .crx file.
Common Download Station 1: http: //www.cnplugins.com/
popular download site 2: http: //chromecj.com/
2. .crx file suffix to .zip, unzip.
I installed the software bandizip decompression, decompression error: file corruption.
Try to open the .zip file with the command line, type unzip filename.zip, error, and should be repaired with -F command.
Repair command: unzip -F filename.zip --out outname
repair is successful, with bandizip decompression outname.zip file.
3. Add to the chrome.
Open URL: chrome: // extensions /, open the upper right corner developer mode option. Click "Load unpacked extension" to open outname folder, OK, the installation was successful.