I was struggling with this myself, until I came across this article. I had to make a few adaptations for my setup as follows (for the purposes of this post, the unavailable document class I wanted to install was called clv2, for which I had a clv2.cls file):
Step 0:
This was not mentioned in the article, nor do I know if it's absolutely necessary, but I quit LyX before I started this process.
Step 1:
Copy the clv2.cls file in your latex directory. To find where it is go to LyX > Tools > TeX Information > LaTeX Classes > Show path. For me it was /Users/sylvie/Library/texmf/tex/latex/lyx/.
When I did LyX > Tools > TeX Information > LaTeX Classes > Show path, I saw /usr/local/texlive/2011/texmf-dist/tex/latex
There was no lyx directory there, so I had to create one for myself. Then I copied clv2.cls into /usr/local/texlive/2011/texmf-dist/tex/latex
Step 2:
Make a .layout file with the same name (clv2.layout)
This was very straightforward. I wanted an article (not a manuscript) though, so my layout file looked like this:
#% Do not delete the line below; configure depends on this
# \DeclareLaTeXClass[clv2]{article (clv2)}
# Input general definitions
Input stdclass.inc
Step 3:
Copy the clv2.layout file into your package content. For me it was Applications > LyX > Contents > Resources > layouts > clv2.layout
My package content was located at /Users/ashwin/Library/Application Support/LyX-2.0/layouts, so that's where I copied clv.layout to
Step 4:
Open a terminal and on the command prompt write sudo texhash (LaTeX will be reconfigured)
This was very straightforward. I was asked for my password, which is normal.
Step 5:
Open LyX, and then go to LyX > Reconfigure, and Restart Lyx
Again, this was very straightforward. No hitches here.
Step 6:
Go to Document > Settings > Document Class > manuscript (clv2)
Since I wanted an article and therefore changed clv2.layout, I found an article (clv2) in my list of document classes.
Hope this helps
Best Answer
The following worked for me. It's a hybrid of this online how-to and my older question on how to do this on Mac OS X
Step 0: Quit LyX
Step 1:
Step 2:
Mine was in
C:\Program Files (x86)\MiKTeX 2.9\tex\latex, where I had to create thelncsfolder (which requires admin privilege escalation). I extractedllncs.clsandllncsdoc.styto this folder.Step 3:
Open up
cmdand runtexhash. Very straightforwardStep 4:
It wasn't obvious to me where MikTeX Settings was. This other SX post showed me what to do. Just look for
adminin the Start Menu's search bar and you'll seeMikTeX Settings (Admin)Step 5:
Very straighforward
Step 6:
You're done. Go do a happy dance or something