Hi,
My sort ordering settings are from jDownloads version 1.9.x
I do not use the jDownloads tree module because there was no version of it for the alphabetical ordering of categories
I will explain: In the layout of the categories at the frontend of the site, the categories and subcategories  ordered alphabetically from jDownloads 1.9.x to 3.2.59 (except for some versions when there was a problem with the same)