Even downloading the 6.14 installer will NOT help you. (but it is better than 6.3!)
[v6 in the link given above is for v6.14]
The raw files from the TG6 require Lightroom Version 8.3 which is only available by the Photography plan subscription.
https://helpx.adobe.com/camera-raw/kb/camera-raw-plug-supported-cameras.html
You can either-
1. Subscribe to the Photography plan (US$9.99/m) for the best combination of photography software, or
2. Download and use the Adobe DNG Converter App to convert your raw files to DNG raw, then import to Lightroom.
https://helpx.adobe.com/photoshop/using/adobe-dng-converter.html
Regards. My System: Windows-11, Lightroom-Classic 15.4.1, Photoshop 27.8, ACR 18.4, Lightroom 9.4, Lr-iOS 10.4.0, Bridge 16.0.3 .