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First, check to see if the driver you need is in the Driver Pack described above. Also, confirm that the package you are working with is indeed a driver and not listed as a Dell "utility" or "application". Try extracting the files from the driver using either 7zip or Universal Extractor. Also, run the installer with a /? or /help switch. Some Dell installers have command line switches to extract the drivers to a folder.
Multiple
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folders for a
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driver
Some Dell drivers come packaged in 2 or more folders. In most cases, both set of .inf and related files are necessary for the hardware to function properly. While you could add each folder separately to the driver library, this is messy and difficult to manage. Simply copy all the drivers from the other folders related to the same package.
For example, one of the Intel chipset drivers for the Latitude E6420s divides the drivers into 2 folders, called MEI and SOL. Copy the drivers from SOL and MEI into one folder and select that folder when adding the drivers through the console. Since all the necessary files for that driver are in that folder, they can now be added as a single item in the driver library.
Alternatives
There are 3 other commonly used alternatives to Landesk HII. Some of these cannot completely replace Landesk HII due to other limitations but may be used to as workarounds or together with Landesk HII for a more seemless solution.