Why there is no "SailfishOS Emulator.vbox" separately, without SDK?

What do you mean by "you can unpack the installer". It is *.run executable = SailfishOSSDK-Alpha-1312-Qt5-linux-64-offline.run I do not think it is simple archive.

But in anyway if they provide vbox disk, that I should be able run it under VBox.

Correct me, if I'm wrong.

Run with -h parameter to see all options. One of them allows you to extract content withtout installing (don't remember which one right now).

~$ ./SailfishOSSDK-Alpha-1312-Qt5-linux-64-offline.run --help Usage: SDKMaintenanceTool [OPTIONS]

User: --help Show commandline usage
--version Show current version
--checkupdates Check for updates and return an XML file describing the available updates
--updater Start in updater mode.
--manage-packages Start in packagemanager mode.
--proxy Set system proxy on Win and Mac.
This option has no effect on Linux.
--verbose Show debug output on the console
--create-offline-repository Offline installer only: Create a local repository inside the installation directory based on the offline installer's content.

Developer: --runoperation [OPERATION] [arguments...] Perform an operation with a list of arguments --undooperation [OPERATION] [arguments...] Undo an operation with a list of arguments --script [scriptName] Execute a script
--no-force-installations Enable deselection of forced components --addRepository [URI] Add a local or remote repo to the list of user defined repos. --addTempRepository [URI] Add a local or remote repo to the list of temporary available repos.
--setTempRepository [URI] Set a local or remote repo as tmp repo, it is the only one used during fetch.
Note: URI must be prefixed with the protocol, i.e. file:/// http:// or ftp://. It can consist of multiple addresses separated by comma only.
--show-virtual-components Show virtual components in package manager and updater --binarydatafile [binary_data_file] Use the binary data of another installer or maintenance tool. --update-installerbase [new_installerbase] Patch a full installer with a new installer base --dump-binary-data -i [PATH] -o [PATH] Dumps the binary content into specified output path (offline installer only).
Input path pointing to binary data file, if omitted the current application is used as input.

I can't see any option that allow my to even see a content.

Thanks in advance

--dump-binary-data

Thanks. I will try when I download it.