Why is MATLAB R2020a, R2020b, or R2023b not detecting a silent Support Package installation?

I installed a Support Package silently with an offline Support Package download. When I open MATLAB, the support package doesn't appear to be installed when checking Add-ons>Manage or when running:

matlabshared.supportpkg.getInstalled

Answer 1

[MathWorks Support Team]

This issue may occur if you're using R2020a Update 5 or older, R2020b Update 1 and older, or R2023b. Please either use a later update of R2020a/R2020b or follow these workaround instructions.

1. Navigate to the folder C:\ProgramData\MATLAB\SupportPackages\R2020b (replace "R2020b" with R2020a/R2023b, if applicable)
2. Edit the file "sppkg_matlab_info.txt" with a text editor, such as Notepad.
3. Modify the path found in the folder to one of the following, depending on your release:

(R2020a)@C:\Program Files\MATLAB\R2020a
(R2020b)@C:\Program Files\MATLAB\R2020b
(R2023b)@C:\Program Files\MATLAB\R2023b

Please note this path is case sensitive within this file. Save the changes and restart MATLAB.

[Julian Hapke]

We recently had the same issue in R2023b. A colleague found out that the silent support package installer put the nearly correct path into the file. Unfortunately it was a lowercase c for the drive letter and not an uppercase one, so MATLAB did not find the support package. Changing it to a capital C fixed it. Interestingly just installing it twice also fixed the issue!