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Please check the official website of Megacad or the company that developed it (if you know who it is). They might have an archive or a download section where you can find older versions, including 4.5.
You're looking to download Megacad 4.5!
If you're unable to find Megacad 4.5 through the above options, you can try contacting the software developer or their support team directly. They might be able to provide you with information on where to download the software or offer an alternative solution.