Mention must be made that the majority of the versions available as such are not identical to what you've received in disc format together with the Canon digital camera. Only parts of software are available for different applications. Check SDK (software development kit), for instance. When the original software CD is lost, you may purchase a new one from the Canon USA Customer Support Center if you are a U.S. resident. For other countries, anyone interested in a Canon digital camera software should contact the regional Canon representative for further assistance.
The use of the original CD is not difficult. Once your computer reads the file, the Canon digital camera software will start the automatic installation through its wizard feature. You just need to follow the steps and click 'allow', 'yes', 'next' and 'finish'. The installation is not time consuming, and once it's over you can start data transfer between the digital camera and the computer. Nevertheless, it is advisable that you read all the instructions prior to the installation, so that you don't face any compatibility issues and similar problems.
It may prove indeed difficult to use the camera without the original software. Then, you'll start searching for a solution and eventually try several types of downloads. Sometimes, you may need to perform file extraction to get only the file that you need from an archive, but this varies from case to case. It is good to talk to someone who is good at computers and camera technologies if you can't handle things by yourself. So many people panic when hearing about software and drivers because they feel overwhelmed by a domain they know little of; yet, this is by far the wrong approach.
Even without the original Canon digital camera software, you can make the camera-computer transfer work. You just need a bit of know-how or some expert's advice in the matter. One last tip is to pay attention to compatibility when making downloads so that you get a driver or a software that matches your digital camera.