: If this sounds too complex, it is much easier to download the pre-compiled installer from the Official Lazarus SourceForge .
Lazarus-main.zip is typically a source code archive downloaded directly from the development repository (often GitLab or GitHub). It contains the "main" (development) branch of the software, which is the most current, albeit sometimes less stable, version of the environment. Quick Setup Guide Lazarus-main.zip
Lazarus is the IDE, but it requires the Free Pascal Compiler to actually build programs. : If this sounds too complex, it is
: Running from a zip allows you to have multiple versions of Lazarus on the same machine without them interfering with each other. : If this sounds too complex