I wanted to go back to Win on my laptop. 8 go down, so I reset it. Then the laptop wanted to reinstall win 10, so do I have it?

Switched off. When restarting, the message that Windows can no longer be installed because of an error always comes up. Only when I restart it. If I try that, the same message comes up, can you help me?

You can only downgrade by reinstalling Windows8 from the installation disk.

Since you switched off during an update process, your system is no longer bootable. This means that at least one Windows repair (Win10) must be carried out.

Ok and how does it work?

You boot from your Windows8 installation DVD / USB stick and reinstall Windows.

Without the installation medium you will not get any further because you have obviously destroyed your installation.

Well, I'll send you a picture…

The question is, why do you want to do something stupid? What do you have against Windows 10? It's one of the best and most stable operating systems, I don't even remember crashing with it.

My laptop is designed for win 8 and almost crashes on win 10

That sounds very… Strange to me. What kind of laptop do you have

Lenovo, bought used in 2015 …

Ka as the model is called