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R2020a Update 2 Installation Files can not be used to install a toolbox to R2020a Update 3 MATLAB. If installing the toolboxes offline, the installation files must match the update version of MATLAB, e.g. you cannot install a toolbox for MATLAB R2014b into MATLAB R2015a.
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If there is an update available for your version of MATLAB, click the Update button to the right of the update name to install it. Toolboxes must match the release of MATLAB they are installed into, e.g. The Add-On Manager opens with the Updates tab selected. Hardware accelerated graphics card supporting OpenGL 3.3 with 1GB GPU memory is recommended. On the Home tab, click Help > Check for Updates.The most common cause of this error is updating your License. License Server Does Not Support This Feature. Graphics: No specific graphics card is required. License Manager Error -18: License Checkout Failed.The process requires that the computer in which you hope to install updates. RAM: 2 GB With Simulink, 4 GB is recommended (With Polyspace, 4 GB per core is recommended) It is possible to install updates for MATLAB from a command-line environment.Disk Space: 2 GB for MATLAB only, 4–6 GB for a typical installation.Processors: Any Intel or AMD x86-64 processor With Polyspace, 4 cores is recommended.SUSE Linux Enterprise Desktop 11 and 12***.SUSE Linux Enterprise Server 12 is supported as of R2018a.Ubuntu 17.10 is supported as of R2018a.Support for Windows 8.1 will be discontinued as of R2018b.Windows Server 2008 R2 is not supported as of R2018a.Windows 7even or newer, Windows Server 2012 (R2) or 2016 / Ubuntu 14.04 LTS, 16.04 LTS, and 17.10, Red Hat Enterprise Linux 6 and 7, SUSE Linux Enterprise Desktop 12 or Server 12