Here is the "solid story" on what these versions actually are and how to manage large files properly: The "100MB" Mystery: Reality Check Unofficial Versions:

In theory, a highly compressed version of software uses tools like WinRAR, 7-Zip, or repacking techniques to shrink the installation folder from several gigabytes down to 100MB. These are often labeled as “Portable” or “Repack” editions.

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installs a "backdoor," allowing hackers to steal passwords and personal data. By trying to save money on a "100MB version," Alex loses access to their entire digital life. Legitimate Free Alternatives (Safe & Real)