Edit in:
My mistake, see post underneath this for the correct solution to this problem.
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Using the instruction from https://www.brainy-bits.com/ir-remote-arduino/ to get the header file worked.
That is moved away the “RobotIRremote” and put the https://github.com/z3t0/Arduino-IRremote there instead.
Been a while since doing software so maybe I missed something in the instruction doc but with this done the Nybble code passes verify.
Also a good link to change ownership on the Arduino IDE if using the install package which set "wrong" ownership" when installed on windows.
https://www.faqforge.com/windows/take-ownership-of-a-file-or-folder-by-command-in-windows/
The best way to add irremote.h is using Arduino IDE's library manager. Search irremote and you can find the IRremote by shirriff. I just verified that it's still searchable.
Thanks for your very quick reply! Now reading trough the "Assembling Instructions for Nybble" once again I do see it was my mistake for interpreting the content in paragraph 4.2.1 like: ........search and install "Adafruit PWM Servo Driver, IRremote and QList"
(which of course was not to be found, and shorten down that search string just got me the first library) Instead of the correct, ........search and install "Adafruit PWM Servo Driver" install "IRremote" install "QList" Maybe this post will help if someone in the future are doing the same stupid mistake as I did.
good point, I should rephrase it.