Unfortunately, there is no official application that you can install on Windows 98 to transfer the files. Windows 98 SE is an extremely old operating system, and besides that, no drivers are available for your camera to install on this OS.
I recommend you acquire another PC in order to connect the camera. It's much easier to find the necessary program and use it on more modern PCs because they feature Plug-n-Play support which means you can connect the camera to PC and start transferring.