I'll spare the time explaining who the pixel artist Thaddeus is, anyone who can help me would know.
There was an archive of some of his work in a 7z file called thaddeus.7z . It contained lots of Castlevania related content, as well as material for that Contra style game he contributed to. I acquired it quite a few years ago from a broken link sharing website.
It seems I have failed to preserve it, as there is an overwritten and missing file in each version I have backed up. I looked for the original link I had for a few hours, to no avail.
If anybody else on this forum has this archive or knows someone who may, help and an upload would be greatly appreciated. I believe it's important that his work is preserved.