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Several days ago I did an update I'd been putting off, to 1.8.10. I doubt a registry entry is the cause of your problem.

The 'Windows ZIP file for non admin install' version of the Arduino IDE does not write to the registry. The sketchbook folder location is shown in the Arduino IDE's File > Preferences > Sketchbook location.Īs for the registry, I remember someone saying that doing an uninstallation does not remove it. If you did a manual installation, the ESP packages are installed under the hardware subfolder of your sketchbook folder. If you did a Boards Manager installation, the ESP packages are installed under the Arduino15 folder. You can find it by clicking the link at the line following File > Preferences > More preferences can be edited directly in the file. The Arduino IDE has a 'data folder' named Arduino15.

How could I start a clean installation, i.e.

If you manually installed one of those packages, then there is a bit more of a process to it, but they provide clear instructions.

If you install ESP8266 core for Arduino or Arduino core for the ESP32 via Tools > Board > Boards Manager, it is automatically installed with the package. How is the esptool to be installed? With some other software ?.

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