All operating systems include DirectX with Windows 10 with DX12, so in fact you almost never have to download this API library. However, some older games require a standalone version of DirectX 9 Windows 10 to get the best performance due to low hardware requirements.
Ultimate Windows Tweaker is a software that provides windows users with tools to tweak and optimize their system, compatible with many different versions of windows. There are more than 170 useful tweaks to choose from, providing access buttons to create system restore points and restore default values. In addition, the program also supports security modes, Internet access through a secure user account.
Defender Control is a free software that allows you to disable Windows Defender in Windows 10 completely with just 1 mouse click.
Microsoft has recently officially released the Windows 10 November Update 1909 (Windows 10 19H2) update to all Windows users. To update to this new version, you can go to Setting -> Update & Security -> Windows Update -> Check for update to conduct checking and updating Windows to this version 1909. Or maybe you download the genuine ISO file directly from Microsoft that I shared below to proceed with the manual installation.