Mathematica 5.2 (released 2005) is proprietary software. Downloading it from unauthorized sources is software piracy. Wolfram Research still holds copyright on all versions.
As a student, you likely have access to the most current version of Mathematica (currently v14+) through official channels without paying out of pocket. Mathematica 5.2 For Students Free Download
The Wolfram Cloud Basic plan is free and allows you to use the core Mathematica language (Wolfram Language) in your browser. : $0 Mathematica 5
Every Raspberry Pi comes with a fully functional version of Mathematica and the Wolfram Language pre-installed for free. As a student, you likely have access to
If you are looking for free access to Mathematica's power, there are official modern options:
with your license number to see if a legacy installer can be provided, though they note it is not supported on recent systems. Wolfram Community Student Pricing Download a Free Trial of Mathematica - Wolfram
: It is no longer sold or distributed as a primary product by Wolfram. It can sometimes be found as "new sealed" old stock on eBay for collectors or those with specific legacy needs.