How can i install different softwares in s302???

You just want to connect your Phone to your PC, (Via Cable, IR, Bluetooth) Anything you have.

If you are on IR or Bluetooth, just send the .jar file to your phone it will receive it, and then ask you to install it.

And if you are on Cable (USB) then when you will plug-in you phone the phone will ask you few options, Select File Transfer, after that you will see a Removable Drive in you "My Computer", enter in it, you will see different folders like Sounds,Videos... Enter a folder names Others, and paste the .jar file there. Remove the Cable, and In you Phone Menu Enter File Manager > Others, you will see the file there run it, it will be installed.

I Hope this will solve your Query.

If I was helpful, Kindly do Rate!
Regards,
Waqar.