Woke up to my computer being updated to W11 from W10, not too happy about that. I want to use massgrave to change my window to W10 LTSC.

I am not interested in Linux.

So, I went to massgrave.dev and did the script, hit 1, etc. It just say something about permanent changed to key or whatever.

So I went download W10 LTSC iso, hit setup.exe and it asked me for product key. I entered my key, say it’s not right one.

So could somebody run me step by step how to go about it? I’m not really tech savvy. I want literal step by step, telling me exactly what to do.

Thank you.