the official release was 512x384, so you won't find any in 640x480. Sorry.

Those were back when codecs sucked more than they do now. Divx 3 SBC was the defacto standard, and back then we decided for that episode that the much better looking episode at a lower res was better than jacking up the filesize to 240ish megs to get the same quality in the original resolution. When xvid is under-bitrated, it just blocks up and noises up a bit. When divx3 was under-bitrated, it tended to do VERY bad things.

Since that was the original release resolution, you won't be finding it in a different one. No 640x480 anbu-aone version of episode 5 exists.

For reference, unless my disk is dying and corrupting files, the CRC32 for the file should be C2DD44FB.

If you insist on 640x480 for that, you might dig around for the toriyamaworld version of that episode. They did a quite admirable job on the first year or two of the series too, but it won't be in as ready distribution since the series is licensed these days and they don't redistribute licensed stuff.