Arduino 2 Installation

download Windows ZIP file

extract arduino-ide_2.3.6_Windows_64bit.zip in new folder of choice.
After reboot, launch Arduino IDE.exe,
  which sprinkles content at least in C:\Users%username%\:

• .arduinoIDE (262KB)

• AppData/Local/Arduino15: (400MB)
  cache               library_index.json.sig    package_index.json.sig  staging
  inventory.yaml      package_esp32_index.json  packages                tmp
  library_index.json  package_index.json        preferences.txt
  
  'AppData/Roaming/Arduino IDE': (68KB)
  2025-08-10_log.log
  
  AppData/Roaming/arduino-ide: (7.2MB)
  'Code Cache'         IndexedDB        Preferences          blob_storage
   DawnGraphiteCache  'Local State'    'Session Storage'     config.json
   DawnWebGPUCache    'Local Storage'  'Shared Dictionary'   databases
   GPUCache            Network          WebStorage
  

Arduino IDE.exe oopsie

refused to run:

Failed to start the electron application
Error: EISDIR: illegal operation on a directory, realpath 'R:\Temp'

.. where R: is a RAM drive.
However, Arduino IDE.exe runs from a bash shell.

Fight losing battles with Arduino 2 UI
- it keeps not doing anything responsive
- quitting and restarting eventually got Serial Monitor running;
  insists on having board defined..??