Most free "Ultimate" links lead to very old versions (0.8.x or 0.9.x) that do not support modern Unity versions (2020-2023+). Legitimate Sources and Alternatives

UnityEX Ultimate: The Essential Guide to Asset Modding and Free Downloads

If you are looking for a reliable way to mod Unity games for free, consider these legitimate avenues: 1. Official Community Forums

If the standard UnityEX doesn't meet your needs, several high-quality, free, and open-source tools are available: I can't find a Unity Asset Extractor program.

Streamlined workflows for developers creating large-scale fan translations or HD texture packs. Key Features and Comparison