Here's what AI offers. Bear in mind that it's not always 100% accurate...
"The option to save converted files to the source folder (same as input folder) should still be available in NCH Switch Pro, but it might not be immediately visible or its location has changed in the interface. Typically, there is an "Output Folder" or "Save to Folder" field near the bottom of the main window where users can specify the folder for converted files. In that field, there is often a dropdown or a way to select an option like "Same as Source Folder" or manually browse and select the source folder. If this option does not appear as before, it could be due to interface changes in Switch Pro or might require setting through preferences or an output folder dropdown.
If the option to save converted files directly to the source folder seems missing:
Check in the main interface near the output folder selection area. Look for dropdown menus or clickable buttons for folder choice.
Try browsing manually and set the output folder to the folder where your source files reside.
Some versions allow selecting "Same as source" explicitly from an output folder dropdown.
If the UI has changed notably, consult the latest Switch Pro user manual or support for exact current steps.
If needed, consider a workaround of setting output folder to the source folder manually for each batch conversion.
There appears to be no known permanent removal of this feature in the Switch Pro upgrade based on official information. It's likely a UI or setting location change rather than a removal of functionality.
For exact guidance, checking the updated user manual or NCH Software support is recommended if the option cannot be found in the current version's interface"