Hello Sergey, I have tried this, and manually put the subscript.sty file in the latex folder as you described. After reconfiguring and looking in LyX under the menu Tools - TeX Information - LaTeX styles, subscript.sty is still not visible however. When I want to view the PDF it still comes back with the abovementioned error.
On my desktop, where the problem occurs, I run LyX and MikTeX 2.9 under Windows 7. On my small HP netbook, where I use XP, the problem does not occur... However, brewing a PDF on that small machine takes a long time. I remember having lots of difficulties with administrator/user rights when installing LyX 2.0 on both machines. Probably there is a slight difference between both installations. I have a workaround by using math for subscripts now. Kindly, Roel From: Churilov Sergey [mailto:curi...@gf.ukim.edu.mk] Sent: vrijdag 28 oktober 2011 22:30 To: lyx-users@lists.lyx.org Cc: H.R.Schipper@ Subject: LaTeX Error: File `subscript.sty\' not found. Hi Roel, I came across this problem recently and I solved it like this: 1. download file subscript.sty from http://ctan.org/tex-archive/macros/latex/contrib/fragments. 2. Create new folder 'Subscript' in your MiKTeX installation folder (e.g. C:\Program Files\MiKTeX 2.9\tex\latex) 3. Copy the file subscript.sty to the folder 'Subscript. 4. Reconfigure LyX. I am using MiKTeX 2.9 and LyX 2.9 on WinXP. This procedure solved my problem. I hope it can be useful in your case. Regards, Sergey