Some additional information on the "corrupted zip" error: A file is downloaded to C:\Users\%USERNAME%\AppData\Local\Uber Entertainment\Planetary Annihilation\pamm_cache\com.titans.server.robintick.war_turtle_v0.008.zip This file consistently has a size of approximately 85.5kb (as reported by the Explorer interface), but the exact size (as shown by the Properties dialog) varies from one attempt to the next. (87,567 bytes; 87,624 bytes; 87,569 bytes; etc.) Attempting to open the file as a zip archive results in an error stating that it's an invalid archive. Opening it with notepad, however, reveals that it's not a zip archive at all - it's an HTML document! PAMM's debug log reports the Dropbox URL that it's attempting to download the file from. Opening this link in a browser reveals it to be a 404 page. (Since this is my first post to this forum, the software won't allow me to include the link in my post, but you should be able to get it from your PAMM debug log easily enough.) I'm not familiar with how PAMM manages its mod database, but I'd say you probably need to re-upload the file and/or update the PAMM database with the correct/new URL for the mod download.