Total Commander 10.52 is the culmination of incremental perfection:

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After a 30-day trial period, registering Total Commander is required to continue using it without the startup reminder screen. The license is provided as a binary file named upon purchasing a license. The key is a small file (either 128 or 1024 bytes), and it is valid for all future versions of the software, making it a lifetime investment for many users.

Copy the wincmd.key file and paste it directly into the main installation directory of Total Commander. Default path for 64-bit: C:\totalcmd\

If you have purchased Total Commander and received your official license file, activating it in version 10.52 is straightforward. Step-by-Step Activation Instructions

Always keep a secure backup of your wincmd.key file. If you lose it, you can often request a new one from Ghisler Software, but keeping it safe is better.

but the program still says "Unregistered," check these three things: Total Commander - Download - Softonic