Hi @Hana Keightley
What version of IBM SPSS Statistics is this? This error looks like you are having trouble with an installer. I know that the original IBM SPSS Statistics 26.0.0.0 installer was not able to function under macOS 11.0 (Big Sur) and had to be recompiled for Big Sur and later releases of macOS.
See this Blog post.
If you are using IBM SPSS Statistics 26.0, please download the updated installer coincident with IBM SPSS Statistics 26.0.0.2
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David Dwyer
SPSS Technical Support
IBM Software
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