I spotted the issue when updating the GPW data using recent Amibossa, like on attached picture.
Seems it has an issue with the file few_last.zip
Doesn't matter which option I choose to download (Year, Last Month, Last week). Other data other than I expect to be in few_last.zip is visible.
Simply few_last.zip file is NOT present on the server (and it redirects to main HTML page), therefore it can't be unzipped because it is not zip anymore.