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Welcome to Castle Technology's support site for 32-bit C/C++ Development Suite.

Once you are subscribed to the C Support scheme you will be able to register, then login into this site to get the latest updates to the C/C++ Development Suite.

If you have forgotten your login details you may request an email reminder.
If you do not yet have a username and password then please register now
If you have previously registered for USB2, you will be able to login using your existing username and password then follow the 'Add Registration' link to register your C/C++ Development tools.