I cant continue to install new extension because the QRadar Log Source Managemente extension is in "Unsintalling Previewing" status.

Would you be able to provide the text from the error or include additional information? Are you updating the Log Source Management app? Can you provide the steps you used? Are you using QRadar community edition?

1. I Installed IBM QRadar, 7.4.3 (Build 20210517144015), Tuning template is Enterprise.
2. When I try to manage the Event Log Sources, QRadar show me a message box with "A New Application Required" and redirect me to a page to Download "QRadar Log Source Management - QRadar v7.3.1/7.4.0 Compatibility ONLY", I downloaded and try to install it with QRadar Extension but tell me "Install Failed". If I want to install or delete this app QRadar show me "The current state of the application does not allow the requested action." So I cant continue.
3. There is another app similar "QRadar Log Source Management" but is in "Uninstall Previewing" status... so I cant do anything.

Can I do some manually to clean it or resintall it?

Thanks

Log into the console as admin user. Click Admin tab > extension management.

Look at the state of the APP. If its in a failed or unstalled state try to install it.

IF it continues to fail .

Log in CLI access to the Console as root user. Follow the instructions on this article and see what is the status of the Log Source manager app. Also get teh ID number.

https://www.ibm.com/support/pages/qradar-about-qappmanager-support-utility