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).
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.
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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