Current Notes install log is very difficult to understand the cause of the installation failure.
So if Notes installation is failed, the customer need to ask technical support to solve the issue.
To make easy to understand, Please consider to output summary of the installation failure at the end of install log with more information as below.
Why installation is failed. (e.g. File xxx.dll is locked by <Application name>. etc)
How to solve the issue. (e.g. Stop <Application name> and reinstall)