• Description has changed:

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 For the "AVR Header Files" path I'm told to specify the *directory containing avr/io.h include file*.  As there is such file in `c:\avr-toolchain-windows\avr\include\avr` (and it's the only one of that name) I choosed this path (see attachment). Although the dialog still says "Path is invalid".
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+I installed the AVR toolchain from [this Github project](https://github.com/eerimoq/avr-toolchain-windows).

 **Environment**
 Eclipse Photon 4.8.0 with avr-eclipse 2.4.1 on a Windows 10 machine with Java 1.8.0_201.