SUMMARY Kstars fails to install addons that are compressed with bz2 by showing error message "Could not install <addon name>: file not found". Addons that are compressed with gz work without issues. STEPS TO REPRODUCE 1. Fresh install of Kstars on windows (latest website installer, shows in About dialog as 3.7.2 Beta) 2. Data menu -> Download new data -> try to donwload for example Tycho 2 star catalog 3. Error message shown, catalog not installed OBSERVED RESULT Addons in bz2 format are not installed EXPECTED RESULT Addons should be installed SOFTWARE/OS VERSIONS Windows: 10 KDE Frameworks Version: 5.115.0 Qt Version: 5.15.13 ADDITIONAL INFORMATION Most addons coming from https://cdn.kde.org/edu/kstars/main.xml seem to be affected as they are in bz2 format (besides two Mars addons that are in zip format) , addons from https://indilib.org/jdownloads/knewstuff/dso.xml are not affected as they are in gz format. I enabled logging to file and this is the relevant line: [2024-07-27T14:53:16.649 FLE Daylight Time CRIT ][ kf.newstuff.core] - Could not determine type of archive file ' "Q:/temp/temp/eaOHkF-tycho2_mag_12.5-1.1.tar.bz2" ' I verified that the mentioned file does exist and unpacks without errors - so not a download issue.