Software to flash Uno V3

I am new to setting up using Arduino. I have built a 24" x 48" router engraver. I have downloaded the Arduino IDE 2.3.6 and am trying to get the GRBL to flash the card. I have purchased the Arduino R4 Minima but after reading on this site it seems it will not work withGRBL. So I have received the Arduino R3. But I am having trouble getting the IDE to load the GRBL from Github. I have followed the steps included on Github on 3 different computers. Using both windows 10 and 11. When I go into the sketch/ add Library/ Add zip library. then find where I have it downloaded it only shows up as a folder and not a file as grbl. so I can not select it to install. I have tried unzipped and leaving it zipped but still same issue.
There must be something I am missing since it doesn't work on any of the 3 computers.

Any help on this would be greatly appriciated.

Hi @terry_st.

Have you tried following the instructions that are provided here:

https://github.com/gnea/grbl/wiki/Compiling-Grbl#if-you-are-using-arduino-ide-2x

Those instructions should definitely work.

Welcome to the forum

I am not entirely sure what you are trying to download and install and I think that your unfamiliarity with the Arduino environment may be causing confusion. You need at least two things to make your engraver work. One is an Arduino sketch which may consist of multiple files which hold the actual code and secondly a library file or files that hold functions that are compiled into the sketch

Please post a link to what you are trying to download and install.

I had not fond these instructoins. Followed and worked great now have my uno v3 flashed.
Thank you very much for the help on this.

the other response was what I needed to get things rolling. I may need further assistance at a later time to get to what you are talking about.
I am very sure that my unfamiliarity is causing a lot of confusion. But now things are getting clearer.
Thanks

You are welcome. I'm glad it is working now.

Regards, Per