The save location for the files created by PDFCreator can either be configured when creating a new HotFolder in the Wizard or it can be set in the PDFCreator Settings.
In the HotFolder Configs, below the dropdown list to select the printer, you can see an Open Auto-Save Location button if you have enabled the auto-save feature for the selected printer. That is the folder where you can find the created PDF files.
If you want to change the save location of the created PDF files, open the PDFCreator Settings for the profile your selected printer uses and change the Target Location for the auto-save feature to the desired folder.