Hi,
Did you open Edge, download the 01-prepare-data.zip from GitHub and extract it in the Downloads folder as instructed in an earlier step?
If yes, when you attempt to open the ResellerSalesTargets.csv as shown in your screenshot navigate to Downloads --> 01-prepare-data folder and it should be there for you to select. See screenshot below to give you an idea of what it should look like:
Please click Accept Answer and upvote if the above was helpful.
Thanks.
-TP