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If you are facing I/O error 123 or calculators inside ETSmart are invisible then here is the solution

Step 1:

Control Panel -> Clock, Language, and Region. -> Region ->Administrative tab on the top. -> Language for non-Unicode programs, -> Change system locale -> Russion -> Restart your computer.

check setting with pictures https://goo.gl/S0O39F


Step 2:
Download the following corrected Calculators. delete existing Calculators folder and copy the Calculators folder into ETSmartUSB directory.

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