can't install .4.3 with OS 10.13.6

[metropical]

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can't install 4.3. w/OSD 10.13.6

Steps to reproduce

Steps to reproduce the bug. This usually doesn't need to be super detailed.

1. install from .pkg
2. stalls writing scripts

Versions

Please complete the following information.

• .4.3 and MacOS 10.13.6 High Sierra

Hardware

cMP3,1 2x3G QC Xeon, 12G ram

Debug logs

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Debug logs attached here

Other info

Anything else you want to add?
wasn't sure if this was an already posted bug. prolly not too many trying this with this 15yo MacPro. giggle, giggle, giggle.
I'll try the.4 debug version

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[metropical]

tried via homebrew

Installing Cask background-music
==> Running installer for background-music with sudo; the password may be necess
Password:
installer: Package name is Background Music 0.4.3
installer: Upgrading at base path /
installer: The upgrade failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)
==> Purging files for version 0.4.3 of Cask background-music
Error: Failure while executing; /usr/bin/sudo -u root -E LOGNAME=fritz USER=fritz USERNAME=fritz -- /usr/sbin/installer -pkg /usr/local/Caskroom/background-music/0.4.3/BackgroundMusic-0.4.3.pkg -target / exited with 1. Here's the output:
installer: Package name is Background Music 0.4.3
installer: Upgrading at base path /
installer: The upgrade failed (The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.)