This post will provide more details and some useful solutions to fix this issue.
Browse the official website ofMiniToolto get more information.
How to launch Windows 10 Software Center?

Here are two methods for you.
Here are three solutions to fix that the entire Software Center is missing.
Then there will be a message: The operation completed successfully.
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Step 2:Typesfc /scannowand pressEnterafter the message appears.
This process might take some time.
Step 3:The message Verification 100% complete will be shown after its done.

Step 4:At last, typeExitto exit the Command Prompt window.
System restore will be especially useful.
Step 1:In the Cortana search box, typeControl Paneland select it from the options given.

Step 2:ClickSystem and Securityand in this page, clickSystem.
Step 3:On the left, click theSystem protectionlink.
Step 4:Click theSystem Restore…button when theSystem Propertieswindow appears.
Step 6:After confirming the restore point, you’re free to click theFinishbutton.
Step 2:You should mark out the different protection levels with a green check mark.
If not, click thespecificfeature to do some necessary operation.
Step 3:ClickScan Nowto perform a virus scan of your PC.
Final Words
When the entire Software Center is missing, dont worry about it.
The above-mentioned solutions should be enough for you to fix this issue.