Converting Blu-ray to DVD is generally an easy task if you have the right tool. I normally recommend BD Rebuilder for this. You import the Blu-ray as always, then change the output to Alternative Output. Remove the check mark from the box to keep Blu-ray or AVCHD compliant output, then put a check mark next to DVD-5.
However, you are dealing with a series disc. You need a menu to select each individual episode, and you will not get one using the process I just outlined above.
Your first task when working with a series disc is to separate each episode and have each one available to import into your conversion program. My suggestion is to use MakeMKV for this.
Since you have AnyDVD HD, you can run it in the background if you wish, but MakeMKV can decrypt most Blu-ray. If you are working with a Blu-ray that is already on the hard drive, MakeMKV can do this as well.
So, either open the original disc, or open the index.bdmv file found in the BDMV folder of your ripped Blu-ray movie. MakeMKV should show you the individual titles of the series and have check marks next to each one. Remove the check marks next to all except the 1st one. Make a name for this episode in the Properties line. Then rip to the hard drive (you’ll need to select the area) and you’ll have the first episode separated from the others in MKV format. Do this for each episode.
Lets say you had four episodes on this first disc. Now you have four MKV files on the hard drive, each with a name to distinguish it from the others. (Episode 1, Episode 2, etc.). At this point you can import the MKV files into AVStoDVD to make your new DVD-video. Don’t forget to make a menu, and don’t try to import more than 2 1/2 hrs of running time for a single layer disc.