Yes that PDF one is Urtext, about the dover one I'm not sure. However, that BGA edition from IMSLP is, imo, very bad readable so I will copy my Henle edition and post it in the near future

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Anway to move on, since we were not finished yet.
I ended my last post with saying that bars 15-24 were a free-counterpoint episode. So I'm picking up where I left of.
After this episode, which is our second one, the subject enters again in the first voice. Meanwhile, the lower voice contrasts, but as you can see, no countersubject, since it is not used earlier. After the first voice stated the theme again, the second voice enters directly after it, stating the subject for the fifth time in this fugue. After this a new episode begins which lasts from bars 33-40. As you can see, the same figuration is used in this third episode as in the second episode. It also lasts for the same amount of measures.
After this third episode, the subject enters again in bar 41 in the lower voice, again with the top voices contrasting but no countersubject. After this the fourth episode begins, however, this time, unlike the second and third, another figuration is used. Now the figuration looks more like that from the first episode. Look at it. Those up-and-down scales sections in the lower voice and contrasting eight-notes in the top voices. That is seen in the first episode too. Now this episode lasts from bars. 44-49. But after bar 49 there is no subject again? That's right, but te figuration changes so drastically in bar 50, that I like to divide them. So after bars 44-49, our fourth episode, a new episode begins.
This episode, our fifth one, imitates the first bar of our subject in the middle voice, whilst contrasting sixteenth-notes are running up-and-down again in the top voice. Now you notice that the lowest voice is firmly staying at that C whilst the middle voice is harmonically changing? That is to create some tension before we go to the next episode and it is also called a tonal pedal. This episode lasts from bar 50-54. After this episode, our sixth episode occurs.
The sixth episode is a very long one. It lasts from bars 55-71 in which all the material from the previous episodes is used again. First in bars 56-58 something new, the first measure of the theme, but not anymore with that tonal pedal. Then, in bars 59-61 the well-known up-and-down running motive in the lower voice, contrasted by those eight-notes in the top voices. Then in bars 62-65 the imitation of bars 56-58 again but now in the C7 chord. Then in bars 66-71 the most well-known figuration which was first introduced in bars 17-24 again. After this long episode, which is our sixth one, we see the subject entering again in the top voice. After it stated the subject for the eight time in the top voice, it is for the ninth and last time stated in the middle voice. After this our last episode begins.
It consists of our well known bars 17-24 figuration, however, this time it is accompanied by a tonal pedal. This episode ends with a very simple IV-V-I cadence.
Well, I suggest you mark all the subjects in a certain colour and also write down where all the episodes begin.
Now, to move on to the learning part of this fugue:
1. Listen to it, and preferably to a great many interpretations and some harpsichordists as well. Listen to it as long as is needed to be know how it sounds in your head.
2. If you have a notation program, write this fugue down, but write every voice on a different staff. You will be learning the piece from this score. If you don't have a notation software, let me know, I'll do it for you.
3. I want you to follow this score a lot of times whilst listening to the music. The best suggestion of interpretations I can give you is Glenn Gould since his playing of fugues is very transparent and clean. Follow another voice each time.
4. Go to the piano and learn each voice seperately. At this stage you're gonna have to figure out a fingering that works for you. Take your time for this, you will have to know all of the three voices by heart. You must be able to play each seperate voice whilst having a conversation. If you're at this stage, you're ready for the next one.
5. Take two of the three voices, it doesn't matter which ones, and play them together. Do this a lot of times until you can play every combination by heart. Do not proceed until you can do this.
6. Now play all of the three voices all together. In the beginning this will be hard, but because you did all the analyzing and the previous steps (I suppose you did), eventually everything will come together. Do not give up at this point. If you're making a lot of mistakes, which shouldn't be happening at this stage, or if you're messing up the fingering, which also shouldn't happen at this stage, you will have to play it slower. Once you really mastered the fugue, play it as much as possible to never forget it anymore.
Hope that helps,
BW,
Jacob