It causes that temporary files created by WindowsInstaller.Package.InstallPackage.UpdateFilesInOneMediaDisk(..) can’t be deleted after the method is finished. This is caused by the allocation of Record streamRec = new
Record(1); in line 537.
Wrapping the allocation into a using block would solve that Issue.
I already got my Assignment Agreement and would like to get pull requests for v3.x and v4.x through into the reospitories.