Before hunting for a key, you must understand what "Plus" actually adds. The standard is freeware. It includes advertisements (mostly in the player interface and installer) and lacks some advanced features.
Sometimes, tech blogs or software bundling sites (like Giveaway of the Day or SharewareOnSale) partner with GOMLab to distribute legitimate free licenses for GOM Player Plus. These keys are:
Security firms (McAfee, Kaspersky, Malwarebytes) frequently report that 90% of "media player keygens" actually contain:
Unless you are watching RAW 10-bit HEVC videos on a low-end laptop, you will notice zero performance difference between the Free and Plus versions.