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Your Windows 7 System is Too Outdated Roblox
In some cases, when you trying to open the Roblox Player in Windows 7. You could get the following error and the player cannot be run.

When you download then install the KB4534310 from Microsoft Update Catalog, you got another issue:

Download and run three update packages
To fix it, you need to download then install the following updates in order. When asked to restart your computer, you must restart it to continue.
Note
Note: There're several packages to download in the Microsoft Update site. Please make sure you download the correct one based on the Windows version and the Windows architecture.
In my case, i need to download the package for Windows 7 64bit.

Insall the Kb4534310 in Windows 7
Once done, the KB4534310 should be install without any error. Restart your computer one more time to take the changes go into effect.
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