How to get hex file from arduino files ?

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The hex file is converted as part of the Verify (Compile) process.

Select File:Prefences, check Verbose output

When you compile the last 2 lines that are displayed are:

C:\Users\Owner\AppData\Local\Temp\build1191639898936270974.tmp\eightx32display_progmem_eeprom.cpp.hex
Binary sketch size: 8,362 bytes (of a 130,048 byte maximum)

And there's your hex file.