Windows 10: Downgrade windows OS

I'm using Windows Server 2016 Standard Evaluation ver. in Virtual Machine,

Now I want to purchase Windows server License operating license , RDS license and Windows Server CAL license for Virtual Machine,


Pls. suggest should I purchase below three to fulfill my requirement.


1) WinSvrCore 2019 SNGL OLP 16Lic NL CoreLic

2) WinRmtDsktpSrvcsCAL 2019 SNGL OLP NL DvcCAL

3) WinSvrCAL 2019 SNGL OLP NL DvcCAL

:)

 

Downgrading from a pirated Windows OS

You've already mangled your existing operating system by upgrading to a pirated version of Windows 10. Use your Windows 8.1 disk to do a new installation of your original Windows 8.1 operating system. If you have saved the product key from your original Windows 8.1 operating system, then use that product key again to install Windows 8.1.

You can downgrade from Windows 10 to Windows 8, by following the instructions in the answers to this question: How can I downgrade from Windows 10 to Windows 8?. Why not downgrade the pirated Windows 10 to Windows 8 instead and then change the product key and upgrade legally back to Windows 10? There are two reasons for not doing it this way:

1. Your new Windows 10 can inherit problems from the pirated version of Windows 10.
   
2. It's a two-step process to install Windows 8.1 and upgrade to Windows 10 instead of a four-step cumulative history: Windows 8.1 -> pirated Windows 10 -> downgrade pirated Windows 10 to Windows 8.1 -> upgrade to Windows 10. Even though the two-step method doesn't save any time, it still eliminates two unnecessary steps.
   

 

Hard drive/ OS issue

a guy suggested :

• shutdown
• unhooked HDD
• restarted
• yay !!
• reconnected HDD
• restarted
• yay !!

also , try method 3
How do I unlock the drive where Windows 10 is installed?

 

bsod after downgrading from windows 10 to windows 7


Hello there, tom.
I would try these:

• Get your Windows 7 media device and reinstall Windows
• Try auto-repair
• Follow these steps:

1. Put in your Windows 10 media device, boot into the USB
2. Select your language and keyboard input, then click next.
3. Click "Repair this computer"
4. Go to "Advanced options"
5. click system restore
6. Select a restore point before you downgraded to Windows 7.

Hope I helped!