Hi SHumb,
It could be installation issue, check your installation directory does Arria 10 and the Stratix 10 devices are installed correctly.
If not, try to uninstall and re-install again.
Refer to the guidelines link below.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/manual/quartus_install.pdf
Do you have valid license to run Arria 10 and the Stratix 10 devices?
Because Arria 10 and Stratix 10 required license to run in Quartus Pro 18.
Kindly check the link below.
https://www.intel.com/content/dam/www/programmable/us/en/pdfs/literature/po/ss-quartus-comparison.pdf
Thanks.
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