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How to force install Windows 10 technical preview to my laptop?

iice cage

New member
Nov 23, 2014
20
0
0
Since the windows 10 came out, I successfully installed it to laptop several times. Because my laptop is non pro windows 10 technical preview. I always ask how to get pro version of Windows, and accidentally installed a windows 8.1 pro with media center product key. I noticed that this is just a evaluation copy and already expired. Now my laptop too slow and restart every time. Now When I run windows 10 TP SetUp, it always failed to install. The set up says, " we can't tell if your system is ready please try again", can you give more tips to install windows 10 TP to change the expired evaluation copy of product key?
 

iice cage

New member
Nov 23, 2014
20
0
0
Now my laptop doesn't start but on just blue screen with RECOVERY and more options """can't verify the signature or """ it seems like that. I have many importants files from my C drive can I backup those files before clean install? Thanks for the reply.