Hi @Eline Geven
Support for macOS 26.0 (Tahoe) began with IBM SPSS Statistics 31.0.1.0, the current release.
https://www.ibm.com/software/reports/compatibility/clarity-reports/report/html/osForProduct?deliverableId=AEE642D740A24F109CDB29A7DEE29AA7&osPlatforms=spcrAllValues&duComponentIds=spcrAllValues&mandatoryCapIds=spcrAllValues&optionalCapIds=spcrAllValues