I have a problem to install Driver PL2303_Prolific_DriverInstaller to my window 8 Pro computer.
the yellow icon shown in device manager.

A few things on this page are of some note:
http://www.prolific.com.tw/US/ShowProduct.aspx?p_id=225&pcid=41
Correct version of software driver, correct hardware chip for W8/8.1, not counterfeit chipset... if none of those appply then the installer should work. Note that you can download and install directly from Windows Update.

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