Download of LizardTech GeoExpress with MrSID 5.0.2.941 was on the developer's website when we last checked. We cannot confirm if there is a free download of this software available. The following versions: 6.1 and 5.0 are the most frequently downloaded ones by the program users.
The program's installer file is commonly found as GeoExpress.exe. This program is an intellectual property of LizardTech, Inc.
We cannot guarantee that the program is safe to download as it will be downloaded from the developer's website. Before launching the program, check it with any free antivirus software. LizardTech GeoExpress with MrSID is categorized as Photo & Graphics Tools.
From the developer:
LizardTech GeoExpress software reduces storage costs by compressing images to less than 5 percent of their original size using either the industry-standard MrSID® image compression format -- now updated to MrSID Generation 4 (MG4) -- or the ISO-standard JPEG 2000 format, all while retaining the visual quality of the originals.
MrSID Generation 4 (MG4) is the new version of the LizardTech MrSID file format.
You may want to check out more software, such as LizardTech MrSID Plug-in for ArcGIS 3D Analyst, MrSID Viewer or LizardTech GeoViewer, which might be related to LizardTech GeoExpress with MrSID.