Try the below method (bit cautious as we are directly touching the DB here)
(not sure if you have already tried to look for 'list of installed app' from Qradar Assistant App, there also it shows all the running apps, and we can take certain action as well)
>> psql -U qradar
>> select id,name from installed_application;
if you see your app there in the list, then delete it
>> delete from installed_application where id=xxxx;
>> select id,name from installed_application_instance;
if you see your app there in the list, then delete it
>> delete from installed_application_instance where id=xxxx;
>>\q (to quit)
To a tomcat restart and try again to install the app again.
#QRadar#Support#SupportMigration