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Free Trials: Esri offers free trials for many of its products, including ArcGIS Desktop. This can be a good option if you want to try out the software before committing to a purchase. You can find trial offers on the Esri website.

Run Setup: Launch setup.exe and select "Complete" installation type.

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Update: It is highly recommended to install Service Pack 1 (SP1) to fix bugs and improve performance.

Open-Source Alternatives: For those looking for free and open-source GIS solutions, alternatives like QGIS (formerly known as Quantum GIS) offer robust functionalities without the cost.