Here is link to download concept 2.6 xl software.
https://www.se.com/ww/en/download/document/Concept_2_6_XL_EN/
After installing apply below service pack 7.
https://www.se.com/ww/en/download/document/Concept+2.6+SR7+EN/
https://www.se.com/ww/en/download/document/Concept_2_6_XL_EN/
After installing apply below service pack 7.
https://www.se.com/ww/en/download/document/Concept+2.6+SR7+EN/