Alpha 3 Fails to Install.
 

I've tried installing Alpha 3 but just get a the installation failed due to an error. Contact manufacturer.

I've attached a screenshot.

I tried uninstalling the Alpha 2 but it made no difference.

Any suggestions?

Thanks

Can you post installer log? You can get it by launching the installer package, and before allowing the installation to Continue, press Command+L, select Show All Logs in the panel that pops up, then let the installation continue. After it fails, please use the Save button in the panel and upload the saved file here.

Thanks,
Michal

Here is the log:

Feb 21 13:12:27 iMac.local installd[684]: PackageKit: ----- Begin install -----
Feb 21 13:12:29 iMac.local installd[684]: PackageKit: *** launch path not accessible
Feb 21 13:12:29 iMac.local installd[684]: PackageKit: Install Failed: Error Domain=PKInstallErrorDomain Code=112 "An error occurred while running scripts from the package “DisplayLink Software Installer.pkg”." UserInfo=0x7f87b662df20 {NSFilePath=./postinstall, NSURL=file://localhost/Volumes/DisplayLink%20Installer/DisplayLink%20Software%20Installer.pkg#packagecont ents.pkg, PKInstallPackageIdentifier=choice0, NSLocalizedDescription=An error occurred while running scripts from the package “DisplayLink Software Installer.pkg”.} {
NSFilePath = "./postinstall";
NSLocalizedDescription = "An error occurred while running scripts from the package \U201cDisplayLink Software Installer.pkg\U201d.";
NSURL = "file://localhost/Volumes/DisplayLink%20Installer/DisplayLink%20Software%20Installer.pkg#packagecont ents.pkg";
PKInstallPackageIdentifier = choice0;
}
Feb 21 13:12:30 iMac.local Installer[671]: Install failed: The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.
Feb 21 13:12:30 iMac.local Installer[671]: Displaying 'Install Failed' UI.
Feb 21 13:12:30 iMac.local Installer[671]: 'Install Failed' UI displayed message:'The Installer encountered an error that caused the installation to fail. Contact the software manufacturer for assistance.'.

Can you check if removing both choice0.plist and choice0.bom files from /var/db/receipts makes any difference?
Thanks,
Michal

Nope made no difference.

I was able to install Alpha 3 by uninstalling Alpha 2 first

I tried uninstalling Alpha 2 and it made no difference. I then tried to reinstall Alpha 2 and that failed. So I installed 1.8 which was fine and then installed Alpha 2 again over the top.

Back to a working monitor again.