Since it is happening with any version of the the tool that you try, and it worked for you in the past, let's start by making sure that the tool has permission to write the folder that the FIT files are in. The CSV files will be written to the same folder as the FIT files are in, so check that the tool or even yourself have write permissions to that folder. The .bat file is calling java.exe, so also make sure that there is nothing on your machine preventing java.exe from writing to the filesystem or that folder.
Just checked Advanced Security Settings (Windows 11)
SYSTEM, Administrators (me) and my personal account have "Allow" , "Full Control"
Any other troubleshooting or log files we can look at to resolve this??
There are no other log files to look at. Can you debug Java code? The message is being printed from this exception handler. You could trying running the CSV tool through a debugger and see if there is any other information that would help.
https://github.com/garmin/fit-java-sdk/blob/main/src/main/com/garmin/fit/csv/CSVTool.java#L255
The error message "A problem occurred while writing the output CSV files" usually occurs as a result of permission issues, open files, or incorrect file paths. Make sure the CSV is not already open, and save it in a separate folder. Make sure your drive has enough space and run your program with proper permissions. Typically, resolving these common issues results in a speedy resolution of the error and the export of files is smooth.