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"Run the Installation File" could be "execute the installer," "launch the setup program," or "begin the installation process."

For example, the first step: "Visit a Reliable Source: Visit a reliable source that provides a free download of Opnet Modeler 14.5 full version." FREE---- Download Opnet Modeler 14.5 Full Version

Continuing through each sentence, replacing each modifiable word with three options. For "complex networks", maybe "complicated infrastructures|elaborate systems|intricate environments". "Run the Installation File" could be "execute the

The rest of the text needs similar treatment. For the system requirements section, "Operating System" could be OS, system software, or control program. "Processor" might be CPU, central unit, or computational core. "Memory" could be RAM, storage, or volatile memory. "Disk Space" can be storage capacity, hard drive space, or data allocation. "Disk Space" can be storage capacity, hard drive

"Simulation and Analysis" can be "Testing and Evaluation|Modeling and Assessment|Operation and Review".

I should also ensure that the structure makes sense after substitution. For example, "4 GB or more RAM" can become "minimum 4GB RAM", "4 gigabytes or above memory", etc.