What is the Google Pack?

Google Pack is a free collection of essential software from Google and other companies. The software in the Google Pack helps you browse the web faster, remove spyware and viruses, organize your photos, and more.
Google Pack also takes the hassle out of downloading, installing, and updating software. You can download and install the entire Google Pack in just a few clicks. And the included Google Updater helps you discover new programs and keep your current software up to date.

What is the Google Updater?
The Google Updater is the program that downloads and installs all the software in the Google Pack. You can use the Google Updater to monitor the status of your installation, run software that's been installed, or uninstall software. A Google Updater icon will appear in your system tray and will display notifications when there are updates or new software available.

Is all the software in the Google Pack free?
Yes, all the software in the Google Pack is free. Some programs may offer paid versions that provide additional features or ongoing updates, but you'll never have to install the paid versions, and your free version will continue to work as long as you have it installed.

The version of Norton Antivirus in the Google Pack includes 6 months of protection updates that enable the program to identify and remove new threats. If you'd like to continue receiving these updates after 6 months, you'll need to purchase an update subscription from Symantec. Purchasing a subscription is optional.

Do I have to install all the software in the Google Pack?
While we believe you'll find all of the software in the Google Pack useful, you're welcome to install as much or as little as you'd like. To customize your installation package, please click the "Add or remove software" link under the download button on the Google Pack homepage. On the Customize page, simply uncheck the box next to any program you'd prefer not to install and click the "Continue" button to complete the installation process.

What if I already have some of these programs installed on my computer?
For programs you select that you already have installed on your computer, the Google Updater checks whether you have the latest version. If you don't, the Google Updater will install the latest version. If you already have the latest version, the Google Updater won't install the program.

Source: Google