Download the installation file from the official QuickBooks website or obtain the QuickBooks installation disc. Close all open programs, and temporarily turn off antivirus protection. Run the QuickBooks installation file and adhere to the prompts on the screen. Depending on your requirements, select the installation type (normal, custom, or network). When prompted, input the product and licensing information after accepting the license agreement. Start the installation process after choosing the installation location. Launch QuickBooks after the installation is finished, then activate it with your licensing and product details.