Hi all, I figured out a workaround for this issue, try this:

1) Download and install "Locale Emulator" here:
https://xupefei.github.io/Locale-Emulator/

2) Once installed, "Right-click" on "GameSave Manager" shortcut.

3) In the "Context Menu", there should now be a "Locale Emulator". Scroll over it and select "Edit Global Profile List".

4) A "LEGUI GLOBAL" dialog box will popup, under "Location", select "English (United States)". Then check the "Run as an administrator" box.

5) Once done, click "Save As ...", then during "New profile name", save as "English (USA)" (or anything you prefer). Then click "Save".

6) Close the "LEGUI GLOBAL" dialog box once done.

7) Right-click on "GameSave Manager" shortcut, scroll over "Locale Emulator", then select "English (USA)" (or whatever name you saved in step 5).

GameSave Manager should run without issue now. Hope this helps!