Original: http://chromecj.com/utilities/2018-09/1525.html
Some users reflect the sub- version chrome 67 after previously offline installation chrome plugin method can not be used, although small series of computers can still be used, but since there are so many users complained that nature is the existence of such a problem, Xiao Bian collected three the latter can not solve the chrome version 67 CRX drag offline solution install format plug-ins.
[The following real feasible method, if the three methods that does not work, please check your steps. We see another article detailed operation: [Ultimate Guide] Detailed graphics Chrome plug-in offline installation method ]
Note: After installing chrome drag chrome73 version can not be installed successfully will be prompted to "crx-header-invalid", referring to the solution: "CRX-HEADER-INVALID" solution when installing the latest version of Chrome chrome browser plug-ins
The first: you can turn on developer mode (recommended)
chrome settings -> More Tools -> Extensions, you can turn on developer mode!
This is the easiest method, this method is to use small series of their own!
The second method: modifying parameters
First, open the following address: chrome: // flags / # extensions-on-chrome-urls
The disabled instead enable restart it
Third: modify the file format, loaded extensions
Sometimes when you want to install a local chrome plugin, will complain, this time the extension .zip instead .crx plug or .rar, and then change the file extension of good extract to a local folder, and then set in a chrome -> more tools -> extensions: 
in the figure above extensions loaded unpacked, you can just find the extension of decompression.