Hi,
You may close all the running adobe processes from Task manager (windows ) / Activity monitor (MAC) .
Then restart your machine and try installing it again .
Close the following processes :-
- Creative Cloud.exe
- Adobe CEF Helper.exe
- Adobe Desktop Service.exe
- AdobeIPCBroker.exe
- Adobe Installer.exe
- AdobeUpdateService.exe
- AdobeServiceInstaller.exe
- CreativeCloud(URIHandler).exe
- AAM Updates Notifier.exe
- CCLibrary.exe
- node.exe
- CoreSync.exe