Things to do

Use the Windows key + I keyboard shortcut to open the Settings app. (On your phone, swipe the Start screen to the left and tap Settings.) Click Update & security. Click Windows Insider Program.
Click the Stop Insider Preview builds button.
after download the program from https://www.microsoft.com/en-US/software-download/windows10
and just go step by step in this program
then just go step by step installing cheat
u could delete avast, but if u can't or u rly want it just leave it

https://www.windowscentral.com/how-unenroll-windows-insider-program-pc-and-mobile