Nextcloud desktop client MacOS 10.10+ doesn't start on Catalina 10.15.7

📱 Desktop & mobile clients 💻 Desktop
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Hello,
I installed the next cloud client for 10.10+. The installation worked fine, but by starting the programm the follwing error ist showed: On your computer is installed macOS 10.15.7, the program requires macOS 11.0 or higher.
Is ist a bug?