NELLLY wrote:Generally in all the previous packages I needed, I just save the .sty file into C:\Program Files\Miktex\tex\latex.
This may be ok for most packages which are simply a .sty file. Actually, the name
package for a single file doesn't fit well in my opinion.
A package can consist of class files and style files, or may additionally contains fonts or themes such as
beamer
. You can consider it as a collection of files which should be put into the TeX tree, but possibly at different places. That's why it's the best to let a package manager do the work.
NELLLY wrote:Sincerely, this the first time I heard the existence of MiKTeX package manager. I don't know how to use it? Should it be downloaded from the web or all ready it exists in any version of Miktex.
Recent versions of MiKTeX already install it automatically, found via the start menu. Also TeX Live has a package manager, since installing and updating is important and should be easy for the user.
Installing and updating requires a recent version. If your version would be too old, you could deinstall it and install the newest TeX again.
Stefan