If your server Space Engineers or Medieval Engineers is stuck in starting (you will see this if when you hover over the Quick Action menu and it has been saying ONLY Kill Server for more than 20 minutes. Please follow the below steps. This method can also resolve the "Failed to download mods" error.

Login to your control panel and in the Quick Actions list, click on Kill Server
Click on File Manager
Right click → Edit (or select and then click the edit button) on SpaceEngineersDedicated.log



Search this (using ctrl+F on Windows, this is a search tool) for Failed Duplicate Error, this should highlight any mods that have failed to download or are duplicates in the list or have failed in another way. You will see the mod ID next to the failed to download / duplicate error.
a. Remove the mod causing Failed or Error from the Mod list.
b Remove the duplicate mod from your list.
Start the server. If the server doesn't start, check the logs again or contact our support

You can use CTRL+F and search for the mod ids in your list if the list is large and finding the mod is a hassle.

There may be more than one mod causing the issue, so please look through the log!

If the above method doesn't work for you and you find that there are no mods that show failed, or the error persists after removing the mods. Then you can try this method too, however please note that this is an older method and may stop working in future versions of Space Engineers:

Download the world file from Map Manager in your control panel.
Make a new save game folder in saves on your local computer.

The local saves folder can be found C:\Users\Username\AppData\Roaming\SpaceEngineers\Saves\A long string of numbers - Please note that the Username will be the username for your account on your PC. This is the most common location for Space Engineers saves and can be different!

Drag files from the downloaded world into the new save folder.
Load the new save game.
You will then see the mod failed to download error.
Go into the mod settings for that save.
Find the mod that isn't downloading. > Its red and has the workshop ID.
Take that ID out from the mod list in the server in Game Configuration in your server control panel..
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