ownCloud Client is not starting at my iMac with Catalina OS

since the last security update from Catalina to version 10.15.5 on my iMac, I can no longer open the ownCloud client. As an error message comes "The program ownCloud.app can not be opened. Nobody could or did not want to help me from Apple Support and may have referred to ownCloud Support. Oddly, Owncloud works perfectly on my Mac Book. There I have the same version of Catalina I used the ownCloud client version I don’t get any support from OwnCloud Support because I use a freeware version from our project partner Fraunhofer. Does anyone have the same problem that their ownCloud program does not start on their Mac? can someone give me a hint what it could be? Thanks in advance!

Where do you see this version? No problems with my 2.6.1 on 10.15.5

% /Applications/owncloud.app/Contents/MacOS/owncloud --version
ownCloud version 2.6.1 (build 13096)
Git revision 6793f774adcd4beff46923ff7186ff1a9b6ec47c
Using Qt 5.12.5, built against Qt 5.12.5
Using 'OpenSSL 1.1.1d  10 Sep 2019'

You could also try with the 2.6.3 RC4 that will be released as the final 2.6.3 in the next few days:

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