SDKLauncher.exe - entry point not found on Portal Revolution

[WitherCore5118]

Hello,
I'm having trouble using the SDK Launcher for games based on the Strata Source engine. When I launch the .exe file, I get the following error message:

Entry point not found

Context:

Operating System: Windows 11 64-bit
Launcher SDK Version: v0.6.1
ZIP Contents: only the .exe file

Steps taken:

Downloaded the Launcher SDK from GitHub
Extracted the .exe file to the game's bin/win64 directory (or bin/linux64 if using Linux)
Attempted to run the .exe file → error message "Entry point not found"

Additional Information:

The README clearly states that the .exe file must be placed in the game's bin folder.
The problem persists even after following these instructions.
I've already verified that the Visual C++ Redistributables are installed.

Questions:

Does the Launcher SDK require specific game files or missing DLLs?
Is there a full version of the launcher or a fix for this issue?

Thank you in advance for your help.