So uhh...
Those rips of episode 1-5 are definitely not raw rips of the kind one would want for a proper preservation of this stuff.
It looks like they're rips from a DVD recorder (which is fine; far from ideal, but 100% perfectly fine!!), that have then been run through a shitty re-encoder like Handbrake to reduce the filesize.

For those unaware: Handbrake is a popular piece of software to re-encode video and audio. But no one who knows anything about video would actually use it, because the settings are too limited for serious use, and the quality is always really shit.
The real issue, though, is that the settings in this case were set all wrong.
It's been rescaled, but it hasn't been properly stretched out; DVDs save data in 720x480 resolution, which is then stretched on playback by the media player to 4:3 or 16:9. This encode has failed to account for this, so it pads it out to 4:3 by adding black bars to the top and bottom, and resizes the image to 800x600, which serves no benefit except that it makes it more obvious that it has been re-encoded; a very useful red flag that something is seriously wrong. (In a decent encode, you'd leave it at its original resolution, and give it a flag in the metadata to tell the player to play it back in 4:3)
It hasn't been deinterlaced, so the interlacing lines -- rescaled and blurred by the macroblocking and other distortion you get from a low-bitrate encode -- are irremovable, and the original interlaced fields are irrecoverable.
And the audio encoding is absymal.
Essentially, what we have here, as our only preservation of these last four episodes (as well as the accompanying rip of episode 1) is the equivalent of of the Japanese broadcast audio had been shared in the form of 96kbps MP3s with high-frequenty white noise added.
We need either the raw rips to be shared, or -- if those raw rips have been deleted -- for another digitisation to take place. The quality of these files is unacceptable, I'm afraid.
Don't get me wrong, I'm overjoyed that we finally have these episodes, but if they're going to be shared, they should be shared properly. I'm sure this was an honest mistake, which can most certainly be corrected fairly easily.

The point of Dragon Ball is to enjoy it. Never lose sight of that.