Versions Aspose uses version numbers to keep track of product releases. The version number consists of four digits, where the first two denotes a new, or major, release and the last two denotes hot fixes: x.y.z.0 What is a new release? A new release is a full installation of an Aspose product. The installation file includes all necessary files: including the product executable file (ex: Aspose.Cells.dll), help files and demos files. Version number for a new release The structure of the version number for a new (or major) release is x.y.0.0: where x.y is the release number. The first release of a product is always version 1.0.0.0. For example, version 1.5.0.0 means the 5th release of a product, after the initial release. If y is greater than 9, then x is incremented by one (x + 1) and y is set to 0. The release after version 1.9.0.0, then, is version 2.0.0.0. What is a hot fix? A hot fix is a minor release that fixes one or more specific issues reported by customers in the Aspose Forums or introduces a specific new features. Hot fixes are released as is a ZIP file which only includes the product's executable file (for example, Aspose.Cels.dll). A hot fix has many names, some companies refer to them as bug fixes or point releases. Version numbering for a hot fixes The structure of the version number for a hot fix is x.y.z.0:  where z is the number of hot fixes since the last new release x.y. For example, version 1.5.1.0 means 1st hot fix for the new release 1.5.0.0.