If you don't see the merged HDR images after having successfully completed the batch, it's because Lightroom is filtering them out.
This usually happens when your Lightroom filmstrip is set to 'Previous Import', but can also happen if it is set to a collection, for instance.
To see the batched photos, right-click on where 'Previous Import' shows above the filmstrip, and select All Photographs instead.
If you want to avoid seeing your entire catalog after choosing 'All Photographs', right-click on one of the source images and choose 'Go to Folder in Library.'
If you restarted Lightroom and don't see a 'Photomatix -> HDR Batch' item under 'Export' on the contextual menu, then check whether you see it under the 'File' menu. Choose 'File > Plug-in Extras' and check whether there is a 'Photomatix Batch' item there.
If you can't find it there either, then please follow these steps to install the plugin manually:
If you still don't see an 'HDR Batch' item listed under 'Export > Photomatix' on the contextual menu (nor a 'Photomatix Batch' item under 'File > Plug-in Extras') after having downloaded and installed from the above link, then please contact our support team.
Photomatix 'Natural' preset will give you an image that looks very close to an image done with Enfuse.
Photomatix offers different HDR styles, and each style is based on a different algorithm. The 'Natural' preset is from the 'Fusion/Natural' style, which is based on the same algorithm as the Enfuse plugin.
In non-techie language, this means you will get the same, or very close, results as when using Enfuse if you select the 'Natural' preset in the 'HDR Preset' section of Photomatix HDR Batch plugin.
Additionally, the plugin lets you adjust the image's tone and colour using the sliders on the left side of the window that appears when you click on 'Choose Preset with preview'.
If you bought a Photomatix Pro 5 or Photomatix Pro 6 license, you can get the HDR Batch plugin for the price difference between Photomatix Pro and the Photomatix Pro Plus bundle ($20 in USD). See this page for more information.