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Please read below 2 articles for SPSS Statistics on Big Sur and what you need to do for release 26. However, the best would be if you upgrade to IBM SPSS Statistics 27.0.1 release
For release 26 you should install 26 fixPack 1 plus an Interim fix 26.0-IM-S26STATC-MAC-FP001-IF003. Links for downloads are in the articles. You will need to register for an IBM ID with your e-mail address and a self selected password. However, you will still need to obey what is said for issues with SPSS 26 on Big Sur on the articles. Please consider to upgrade to SPSS Statistics 27.0.1: "Anyone looking to upgrade their macOS to Big Sur is highly encouraged to upgrade to the latest version of SPSS Statistics also"
SPSS Statistics on macOS Big Sur (11.0)
https://community.ibm.com/community/user/datascience/blogs/todd-peterson1/2020/11/20/spss-statistics-on-macos-big-sur-110
SPSS Statistics 26 Fixpack 1
https://community.ibm.com/community/user/datascience/blogs/christina-howell/2020/05/27/spss-statistics-26-fixpack-1
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