Hi Chin! My name is David. I am a user of Microsoft products like you, and it is a pleasure to greet you.
Regarding your issue, if the update from Home Single Language to Pro that you purchased from the Microsoft Store doesn't start, it might be due to a problem with the Store app itself. However, you don't need to worry, you haven't lost your money. I can suggest the following processes:
- Although common, initially restart your PC and try again if you haven't done so.
- Press "Windows + R" and type "wsreset.exe" then press Enter, this should clear the Store cache. After this, try the update again.
- Go to Start > Settings > System > System Components > Microsoft Store, click on the three dots (...) and select advanced options, here select repair. After this, try again.
- Another method you can try is to generate the update using the generic key for Windows 11 Pro (VK7JG-NPHTM-C97JM-9MPGT-3V66T) from Start > Settings > System > Activation > Change product key. Adding the product key in this way should also initiate the system update. However, it is important to ensure that you are signed in with the Microsoft account that you used to purchase the update in the Microsoft Store.
Note: This product key does not represent any form of an activation key and is the default key that Microsoft includes in Windows 11 Pro generically.
Let me know if the shared information has been helpful. Regards.