Because this is the definitive edition with all graphical bells and whistles, your machine needs some muscle. However, the repack has been tuned to run on low-end hardware via a custom configuration file included in the _Configs folder.

Version 1.5.3 is not just a random number; it is a significant stability patch. Users of previous versions (1.5.0, 1.5.1, 1.5.2) reported occasional hitches in the "Surface Tension" chapter and rare save-game corruptions. Version 1.5.3 addresses the following:

If you’ve been waiting for the perfect moment to step back into the HEV suit of Gordon Freeman, this is it. The Black Mesa Definitive Edition v1.5.3 Repack

Installing this repack is straightforward, but you must follow best practices to avoid antivirus false positives (common with compressed executable installers).