Index of /macros/generic/2up
      Name                    Last modified       Size  Description

[DIR] Parent Directory 22-Aug-2019 07:27 - [   ] 2up-doc.pdf 15-May-2010 17:27 62k [TXT] 2up-doc.tex 15-May-2010 17:29 17k [TXT] 2up.sty 15-May-2010 17:29 1k [TXT] 2up.tex 15-May-2010 17:29 12k [   ] Changes 15-May-2010 17:29 1k [   ] Makefile 15-May-2010 17:10 2k

Save the files 2up.sty|tex in a directory, which is part of your 
local TeX tree. 
Then do not forget to run texhash to update this tree.
For more information  see the documentation of your LATEX distribution 
on installing packages into your LATEX distribution or the 
TeX Frequently Asked Questions: