Compilation of any sketch fails: '...7.3.0-atmel3.6.1-arduino7/bin/avr-g++": file does not exist'

Development Tools IDE 2.x
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type or paste code hereFQBN: arduino:avr:uno
Using board 'uno' from platform in folder: C:\Users\mattg\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6
Using core 'arduino' from platform in folder: C:\Users\mattg\AppData\Local\Arduino15\packages\arduino\hardware\avr\1.8.6

Detecting libraries used...

"C:\\Users\\mattg\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++" -c -g -Os -w -std=gnu++11 -fpermissive -fno-exceptions -ffunction-sections -fdata-sections -fno-threadsafe-statics -Wno-error=narrowing -flto -w -x c++ -E -CC -mmcu=atmega328p -DF_CPU=16000000L -DARDUINO=10607 -DARDUINO_AVR_UNO -DARDUINO_ARCH_AVR "-IC:\\Users\\mattg\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.6\\cores\\arduino" "-IC:\\Users\\mattg\\AppData\\Local\\Arduino15\\packages\\arduino\\hardware\\avr\\1.8.6\\variants\\standard" "C:\\Users\\mattg\\AppData\\Local\\Temp\\arduino\\sketches\\D38F942971B1BC9763CFD5EC6941A794\\sketch\\baymax_mrk1.ino.cpp" -o nul
exec: "C:\\Users\\mattg\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++": file does not exist

Compilation error: exec: "C:\\Users\\mattg\\AppData\\Local\\Arduino15\\packages\\arduino\\tools\\avr-gcc\\7.3.0-atmel3.6.1-arduino7/bin/avr-g++": file does not exist
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Manually check the given path if it indeed does not exist. It might be that your AV software decided that it is a virus and put it in quarantine or deleted it. Check the AV logs. If so, you can exclude the Arduino15 directory from the AV.

If it's not the AV software, your installation is corrupt for some reason. You can try to fix it by downgrading the AVR board package and next upgrading it again.

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