Hi @miguelraatz,
the error suggests that there’s an encoding mismatch between the HTTP request and the requested zip file. the n8n HTTP request node uses UTF-8 encoding by default and it looks like you’re trying to access a zip file that’s encoded in iso-8859-1.
I’m not sure why this is happening suddenly when it was working normally before though. Has something changed in the request or the ZIP file you’re requesting? Could it have been saved in a different encoding?
You can try converting the content type with a library like iconv-lite suggested in a similar issue here or try to specify the request headers suggested in this post. Could you try these out to see if that does the trick?