To download Office apps from portal.office.com, log in using your Microsoft 365 account credentials. Once logged in, navigate to the "Install Office" section, usually located on the homepage or under the "Apps & Devices" tab. Click "Install Office" to download the Office suite setup file. Open the downloaded file and follow the on-screen instructions to complete the installation. This process installs applications like Word, Excel, PowerPoint, and Outlook. Ensure your subscription includes the apps and that your device meets the system requirements. For mobile devices, visit the App Store or Google Play to download individual Office apps.