Hello,
I have just purchased 5.5.3 from simmarket, tried to install it and the installation was completed. However there were no files being installed, the folder isn't where it's supposed to be. Check the registry and indeed there is EditvoicepackXL in window registry but no files. Uninstall it and reinstall or repair doesn't work.
I tried 5.5.2 setup file from simmarket, same thing. Run as administrator, disable anti-virus.
Using Win10 with P3DV4.
Thank you,
Hoang Le