High Sierra host with Mavericks VM failes

[Sabrina]

Is there a way to make Mavericks work as a VM under High Sierra?
I have a brandnew MacBookAir (2017) with a High Sierra-System and am trying to simulate Mavericks, in order to work with an application that does not run with High Sierra. I got the Mavericks-Download from a reliably source, but VirtualBox says it's too old to run on this Mac. So I'm trying to make an .iso-image that works on HighSierra with VB.

I followed this guide with the CPUID, ran
VBoxManage modifyvm Mavericks --cpuidset 00000001 000306a9 00020800 80000201 178bfbff
sudo gem install iesd
iesd -i /Applications/Install\ OS\ X\ Mavericks.app -o Mavericks.dmg -t BaseSystem

It went alright, but the BaseSystem.dmg could not get renamed to Mavericks.dmg.
Tried to reset permissions, but that didn't help.
I found out that the file was hidden, made the hidden files show up, copied the BaseSystem.dmg into my documents-folder. It stays hidden, so I tried chflags nohidden "filepath/filename", but that did not change anything.

I read that there might also be problems with some esd-settings (?) or something (can't find the thread again). I'm new to Mac and have no clue what that could be.

I've put most of my terminal commands into an etherpad, but am not allowed to post that. I'll do it tomorrow, if I will be allowed then, but I don't think it will help much anyways...

I attached a file with the location of the BaseSystem file, because that was a bit funny...

Would be greatly obliged for any help!

[ChipMcK]

VirtualBox says it's too old to run on this Mac

That reads like a macOS response/message, not a VBox message/response

I doubt that Visual Basic (VB) has anything to your trouble(s) and this forum is for VBox

There is a more recent guide in Mac OS X Guests -- [Howto] Create OSX ISO from the OSX Install app