How to find your GAMS license number: Look for the text file gamslice.txt in your GAMS system directory and check the beginning of the fifth line. Alternatively you can use the IDE (see image below).
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How to find your license number in GAMS IDE (Help > About)
GAMS release required (e.g. 25.2.1) *
To see all our releases go to https://www.gams.com/latest/docs/RN_MAIN.html. If you do not know which version is the last one that is compatible with your license, please enter "00.0". We will then send you a link with the newest version you can use with your license.
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Reason for using the old GAMS version *
We kindly ask for the underlying reasons, be they of technical or financial nature, to better serve our customers.
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