Class LNCS in LyX doesn't work

I found the problem,

A little clarification for those who want to install a class in LyX. Please follow these steps that are mentioned in the previous link:

Step 0:

Quit LyX

Step 1:

Download llncs2e.zip, which contains llncs.cls and llncsdoc.sty. I just googled for a download link and got mine from here.

Step 2:

Copy those files to the folder ...\MiKTeX 2.7\tex\latex\lncs, where ...\MiKTeX 2.7 is the folder in which MiKTeX is installed. On some systems, copy to ... \MiKTeX 2.7\texmf\latex\lncs. The lncs folder will probably need to be created.

Mine was in C:\Program Files (x86)\MiKTeX 2.9\tex\latex, where I had to create the lncs folder (which requires admin privilege escalation). I extracted llncs.cls and llncsdoc.sty to this folder.

Step 3:

Run

texhash

from the command line.

Step 4:

Run MiKTeX Settings. Press "Refresh FNDB" under General. Then, possibly, "Update Formats".

Step 5:

Open LyX and select Tools -> Reconfigure

Very straightforward

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But be sure to put the llncs.cls and llncsdoc.style files in:

C:\Users\YOURUSERNAME\AppData\Roaming\MiKTeX\2.9\tex\latex\lncs

PS. Create the folder lncs if it doesn't exist.