ZIP Archive Corruption: If you don’t receive any error message but still facing the problem, verify the ZIP file extension. Even though the browser doesn’t prompt you anything regarding partial or incomplete download of the ZIP file, comparing the size of the original ZIP (in the source) with the one you have downloaded perhaps clears this. Incomplete Downloaded ZIP File: Inappropriate proxy settings, network glitches etc. The most common reasons for causing corruption or damage in ZIP folders are explained below. There exist various reasons due to which a ZIP archive gets corrupt or damaged and being not empty Windows shows Zip folder as empty. If you are wondering what makes your compressed Zip folder is not empty but Windows shows it as empty, your answers are here- Why downloaded Zip files show empty folders after unzipping? Most of the users come across the problem compressed Zip folder is empty after unzipping it.