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Altera_Forum
Honored Contributor
10 years agohttp://www.digitalsolutionslab.com/installing-quartus-ii-v-13-1-64-bit-on-rhelcentos-6-64-bit/
this page might helps , as additional thing need to be done for 64 bit quartus II installation during in 13.1. probably this still appies in 15.1..