Hi SCAND2,
It is expected the 1SG280-S1 (1SG280LU3F50E3VGS1) is no longer supported (has been remove) starting from Quartus Pro v18.0.
This information is stated under Table 2(Page 6) from the "Intel® Quartus® Prime Pro Edition Software and Device Support Release Notes Version 18.0" :
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/rn/archives/rn-qts-pro-dev-support-18.0.pdf
You can compared the 1SG280-S1 information under Table 2(Page 5) from "Intel® Quartus® Prime Pro Edition Software and Device Support Release Notes Version 17.1":
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/rn/archives/rn-qts-pro-dev-support-17.1.pdf
You can able to check each Quartus software version release notes to find out which devices are being support.
Thank you.
New Contributor
