It is simple to download your new .raw file to your private estate.

Open the Region/Estate window.
Click on the Terrain tab.
Select the Upload RAW terrain file button.
Navigate to the location of the file and click OK. Once you select the file the transfer will start automatically.
A message appears saying Download Starting. It may take a few minutes for the terrain to appear.

When the land on your sim looks the way you want, and all the heights have been adjusted (if desired) Bake the terrain. This will set the current terrain as the default. From this point, the Revert Land tool will revert to this state if needed.
Height adjustments and additional terraforming is possible after the file has been uploaded to your private estate. Contact Cesta Bohemia for a quote if you would like to hire her to do this work for you. The terrain files may also be rotated for an additional L$100 fee.

Prior to purchase, please note: These .raw files are for use by private sim owners only, they will not work on mainland sims. These are terrain files, the islands are not parceled for rent or resale, you may parcel as necessary after the file has been downloaded. If you have prims on the land where you intend to download the .raw file, it is suggested that you remove them. They may be returned or buried below the land. There are no refunds, ever, for any reason. All of these files are guaranteed to work. We have tested each one, and/or are using them at present. If you have any questions regarding the purchase,or the process to upload your new file, please contact Cesta Bohemia or Zane Kleene in-world, or e-mail us. Do not attempt to sell or distribute these .raw files. Time and effort has been spent creating them for use. Doing so is a violation of the TOS and you will be reported.