You need to have a 3DEXPERIENCE ID member of your company (Dassault Systèmes Customer Account).
Our partnership with Dassault Systèmes benefits out customers by providing access to download all availalbe Dassault Systèmessolutions through the Dassault Systèmes Portal. https://www.3ds.com/support/ 
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In order to make downloading Dassault Systèmes software easier, often downloads are split into multiple parts. However, in this form it cannot be installed. It is important to never attempt an installation of Dassault Systèmes products from a compressed file (.zip, .7z, .rar, etc) as the installation will generally fail. 
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Often users install CATIA without documentation as this speeds up the installation process. You can install CATIA has already been installed, but there are a couple of settings which are required to be set afterwards. The documentation can be installed on each individual machine or on a shared location e.g. on a server. We recommend that if there are a large number of CATIA users, then installing on a shared location would be best suited. Having the CATIA Documentation files installed allows the user to access the help files though CATIA. The Help files provide documentation on basic tasks, glossaries, customisation (toolbars, standards and settings) and more. 
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It is recommended to install the latest DSLS (DS License Server) release.
The minimum requirement for using a current Dassault Systèmes product is a DSLS Server Release that matches the year of the respective product release, e.g., CATIA V5-6 R2022 requires at least DSLS License Server Release 2022x. Older CATIA releases with DSLS licensing will still be functional. 
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When using Dassault Systèmes products such as CATIA, there are various versions available.
The DSLS license server utility will only allow you to use the same version of CATIA or lower. If you are using CATIA V5-6R2022 and also have DSLS License Server R2021x then CATIA will not be able to obtain a license.
The good news is this can be resolved relatively quickly and easily. You will need to uninstall the older version of the DSLS License Server utility then install the new version after. 
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You can permanently remove your DS license service at any time, as conditions warrant. This process involves stopping the license server and removing the software, and deleting any directories and files that are left behind. 
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A nodelock DSLS (Dassault Systèmes License Server) License is a type of software licensing mechanism used by Dassault Systèmes for their range of products, including CATIA, SOLIDWORKS, and other 3DEXPERIENCE applications. Unlike floating licenses, which can be used by any eligible user within a network, a nodelock license is restricted to a specific machine or node. 
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This guide will explain how to configure the Dassault Systèmes License Server (DSLS) and enroll DSLS licenses using the License Administration Tool provided by Dassault Systèmes. 
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This guide will explain how to configure a client machine to request and use a (concurrent) license from a DSLS license server. 
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When a license is offlined using DSLS, the license is 'locked' from further use on the server (until the offline period expires or the license is restituted). 
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