Sharepoint Subfolder download

With the Script/Function above from the link, I have been able to specify folder "Shared Documents" on a site page and get all subfolders and files within it however struggling to get to desired subfolder and get it's subfolders and files from it

My requirement : Sharepoint has 7 Subfolders for my destination subfolder where it has Month wise SubFolders again lets say Jan 20, Feb 20, Mar 20

I am interested in downloading the files from these month-wise subfolders

I want to exclude unwanted files/folders such as "Forms" or "Documents"

I tried the below script/function as well and it doesnt get me anything

https://pastebin.com/Dg4ZSdfy

Please help me as I feel I am stuck/missing something

Thanks

Archer