Because Flexi 8.1 is older software (released circa 2008-2009), installing it on modern computers (Windows 10 or 11) requires a specific procedure. It was designed for Windows XP and Vista, so compatibility modes are often necessary. Here is a comprehensive guide to installing Flexi 8.1. Prerequisites

Administrator Rights: You must be logged in as an Administrator. Software/Serial Number: Ensure you have the DVD/ISO or the downloaded installation files and your specific serial number (usually starts with S81... ). Security Key (Dongle): Flexi 8.1 usually requires a USB hardware key (dongle) to run. Do not plug this in yet.

Step 1: Prepare the Installation Files If you have a physical DVD, insert it. If you have a downloaded ZIP or ISO file:

Extract the ZIP file or mount the ISO file to a virtual drive. Navigate to the folder and locate Setup.exe .

Step 2: Run as Administrator (Crucial)

Right-click on Setup.exe (or the installer file). Select Run as Administrator . If Windows asks for permission (User Account Control), click Yes .

Step 3: The Installation Wizard

Welcome Screen: Click Next . License Agreement: Select "I accept the agreement" and click Next . User Information: Enter your name and company. Serial Number: Enter your serial number exactly as provided. Click Next .

Note: If the serial is invalid, the installer may not let you proceed. Double-check for typos (0 vs O, 1 vs I).

Destination Folder: It is highly recommended to keep the default path ( C:\Program Files (x86)\SAi\Flexi8.1 ). Click Next . Production Manager: Ensure the option to install Production Manager is checked. Click Next . Setup Type: Choose Complete (recommended) or Custom if you know exactly which drivers you need. Click Next . Install: Click Install to begin copying files.

Step 4: Hasp Driver & Security Key During the installation, the installer will attempt to install the HASP driver (security key driver).

If a window pops up asking to install "Sentinel HASP" or "Aladdin HASP" drivers, allow it. Important: Wait until the installation is fully finished before plugging in your USB security key.