understanding and debugging the core update process
Installation and Configuration
There's definitely something up with your server - this is not a marketplace or jamroom.net issue.
How it works:
1) Your marketplace module contacts jamroom.net and tells it the versions you are currently running
2) It responds with an UPDATE version, a URL to download the update from and an MD5 checksum of the file
3) the marketplace module on your site downloads the file to a temp location and verifies the checksum
4) it unzips the file and moves it to the versioned directory in the /modules directory
5) It swings the symlink to the new directory
6) It triggers the verify_module event so the updated module can do any work it needs as part of the upgrade process
Let me know if that helps.
Let us know if you have any questions getting up and running.