While the desire for access to is understandable, it's crucial to consider safety and legality:

This version introduced the and the Hopper , as well as the Daylight Sensor . Before this, automation was extremely limited. This update created the foundation for all modern automatic farms. Playing 1.5.2 allows you to experience the birth of complex automation without the clutter of modern redstone components like observers.

You can find the portable version of Minecraft 1.5.2 on various community-driven sites, such as GitHub or dedicated "unblocked games" hubs.

Whenever possible, prioritize browser-based HTML5/WebGl emulations of classic Minecraft over raw executable downloads. If downloading a portable folder, ensure it comes from a reputable community archive. Use a Standalone USB Drive

: Many "unblocked" sites host a Java-based or emulated version of 1.5.2 that runs directly in a web browser, circumventing the need to download files. Standalone Portability

Assuming you have downloaded a clean, unblocked portable version, here is the exact process to play without admin rights.

These are almost always scams. Use a launcher that allows "Offline" or "Demo" mode.

How to Safely Play Unblocked Games G+ at School or Work - PureVPN

Since it doesn't install files into the system's "Program Files," it leaves very little trace on the host computer.