Thank you both for your patience. I know this must be very annoying to you. I was expecting some kind of folder with "*.cgid" files, according to dyndolod documentation. So Finding the .ini and .bsa file you are pointing out in your screenshot did not look like the right thing to me. Installing it did not make a difference in dyndolod: the grass option was still greyed out, and it said no grass cache was found. So it still seemed like the wrong file to me.
What did help, was change cgid=gid and Level32=1 in the dyndolod ini.
I was just wondering if there was a seperate section on the dyndolod.ini that I was supposed to have followed, because these ini settings do not seem to be in the guide itself, and I promise I followed it very carefully. I only found this info on the forum.