Still Unable To Update Modules
Installation and Configuration
Do a manual upgrade. Something about the server you're on isn't co-operating with the jamroom marketplace system the permissions idea would be the correct way to fix it, but since that doesn't work you can download the latest version from here:
https://www.jamroom.net/products
Click "Download Open Source". Then un-zip that and use SFTP to upload it to your server. Over-write any files on the server and you will be upgraded.
After that run the integrity check from ACP -> MODULES -> CORE -> SYSTEM CORE -> TOOLS -> INTEGRITY CHECK
Then you can look at the ACP -> MODULES -> CORE -> SYSTEM CORE -> TOOLS -> SYSTEM CHECK to see if there are any orange lights for things that are not working on your server.
It could be that your server does not have 'symlink' enabled. Or something else, I'm just guessing.