unfortunately the requested software Catalina 10.15 is not available in the German appstore.
Am trying to update OS X Yosemtie 10.10.5 on my MacBook Air (late 2010) to Catalina. Where to find or access the update alternatively??
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Try the links on this website: https://support.apple.com/de-de/HT211683, but they will work only with Safari.