Create a temporary directory on the C drive. E.g. c:\opta\download. For a new installation download zip file(s) below. See download help below for unpacking zip files. For subsequent updates only download zip files with newer dates. Version 5.1 normally saved in the OPTA sub-directory on the C disk.

opt51all.zip. (2/3/2012; 10,960,299 bytes)

Download Help for version 5.1: Help

Used to unpack files after download: install.bat.

Used to unpack zip files after download: pkunzip.exe.