Hi jovirkku. I could solve my problem “no android apps/icons anymore after successful 4.4.0.72 → 4.5.0.16 update” in the meantime with help of jolla.customer.care and the community and your help. By advice of jolla.custom.care I gathered log files via this link Collect Persistent Logs | Sailfish OS Documentation. I send them to the jolla.customer.care and they said I should make the update to 4.5.0.18 first. After the update unfortunately again no android apps/icons were there. Then I removed all my installed waydroid files and apps and the file .storage_migration_done from default user/android_storage and made a reboot. Then I again tried on the CLI the commands systemctl restart aliendalviek, waited 1 min, canceled the command with ctrl^C and entered the command systemctl stop aliendalviek, waited some sec. and again entered systemctl restart aliendalviek. Then the status of my android app support button was on ‘running’ (before only a busy cycle was shown). And all of a sudden all my android icons were back on the grid panel and every android app was working like before. 
Many thanks for your support !!! Now I hope that the next update will work smoothly.
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