The No download source message indicates that theres no download source available.
This way, your game may be stuck on launching or stop working.
Then you are able to use the introductions to fix the download issue.

Option 1.
Step 2: In theSettingspopup, click onDownloadsfrom the left side.
Then look atDownload regionand you will see your current location.

Step 3: choose thearrow iconto change the download region which you want to download content from.
When receiving a restart prompt box, chooseRestart Now.
Then wait for it to restart and test whether the error persists or not.
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Option 2.
Step 1: Go toSteam app > Steam > configs, then select theDownloadstab on the left.
Step 2: In theClear Download Cachesection, tap on theClear Cachebutton.

Step 3: Then scroll down to chooseIn Gamein the left pane.
Navigate toDelete Web internet tool Dataand click onDeleteto remove all internet tool history, cached files, and cookies.
How to use Steams Storage Manager to manage your games?
With the help of this detailed guide, you’re able to easily use this feature.
Option 3.
Verify the Integrity of Game Files
Step 1: Open Steam and go to theLibrarysection.
Step 2: Right-punch the game that is experiencing the issue and selectProperties.
Step 3: In the left pane, chooseInstalled Filesand click onVerify integrity of game fileson the right.
Step 4: When finishing the check, relaunch the game for a check.
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Option 4.
Reinstall the Problematic Game
Step 1: Launch Steam and go toLibrary.
Step 2: Locate and right-choose the problematic game.
Then hover overManageto selectUninstall.
Step 3: Download the game again and see if the error is solved.
Option 5.
Here we take Windows 10 as an example.
Step 1: InWindows search, typeControl Paneland grab the match.
Related post:
Slow Steam Download?
Note that saving your precious game files is essential before proceeding with the last two solutions.