The Canadian site that
@MBGraham linked appears to still have only the separate file versions of the FSM; i.e., each of the perhaps 700 - 1000 pdfs must be downloaded and compiled to make up a complete FSM, although it's possible that with a subscription the single download file would be available. (But I don't see the 2019 Outback listed yet in any event).
On the SOA site at
https://techinfo.subaru.com/stis/#/login all the FSMs are single file downloads, with indexing.
Incidentally, although the Canadian site purports to be from Subaru Canada Inc, in my last two uses of it some time back, the 72-hour subscription cost of #34.95 is in $US. Also, the Canadian site does not have the same range of documentation that is available from the SOA site.
Also, for FSMs, it's not necessary to use the VIN; just year, model etc. The FSMs are not VIN specific.