I tried to change the addons.config and even tried to delete it let it generate new. The problem still remains, no way install any addon, even not from the scratch.
Now I restored my addons.config and switched back to RC1 and all works fine - all addons are back.
My complete install line was:
2019-12-18 14:21:45.976 [ERROR] [core.karaf.internal.FeatureInstaller] - Failed installing ‘openhab-package-expert’: No matching features for openhab-package-expert/0
2019-12-18 14:21:46.115 [ERROR] [core.karaf.internal.FeatureInstaller] - Failed installing ‘openhab-persistence-mapdb, openhab-binding-exec, openhab-misc-openhabcloud, openhab-binding-avmfritz, openhab-binding-network, openhab-binding
-amazonechocontrol, openhab-misc-hueemulation, openhab-ui-habpanel, openhab-binding-gpio1, openhab-ui-restdocs, openhab-binding-mqtt, openhab-transformation-map, openhab-ui-classic, openhab-ui-habmin, openhab-transformation-xslt, open
hab-transformation-exec, openhab-ui-paper, openhab-transformation-scale, openhab-binding-samsungtv, openhab-voice-voicerss, openhab-transformation-javascript, openhab-misc-ruleengine, openhab-transformation-regex, openhab-transformati
on-jsonpath, openhab-binding-zwave, openhab-binding-wifiled, openhab-binding-tankerkoenig, openhab-transformation-xpath, openhab-binding-hpprinter, openhab-persistence-rrd4j, openhab-ui-basic, openhab-binding-ntp, openhab-binding-open
weathermap, openhab-binding-fritzboxtr0641, openhab-binding-astro, openhab-binding-pushbullet, openhab-binding-knx’: Unable to resolve root: missing requirement [root] osgi.identity; osgi.identity=bundle; type=karaf.feature; version="
[4.2.7,4.2.7]"; filter:="(&(osgi.identity=bundle)(type=karaf.feature)(version>=4.2.7)(version<=4.2.7))"