Total noob/newbie - can't even get started (jPortable loader can't be found.).

Hi,

I learnt about PortableApps today and am trying to install one particular Java app to USB.

(I m currently using an HP netbook with Windows 8.1, 64 bit)

As advised in http://josm.openstreetmap.de/wiki/USB_Stick

I went to

https://portableapps.com/download

downloaded, and ran the .exe file

A front end for portable apps appeared.

Downloaded from

​https://portableapps.com/apps/utilities/java_portable_launcher

to my USB drive, double clicked on the downloaded file.

This opened an installation box, which finished with a "completed" message and the opition to tick "Execute jPortable Launcher".
I left this unticked and clicked on Finish.

I downloaded the java app (JOSM) I wanted to run to the USB drive.

I closed the Portable Apps front end, dismounted my USB drive and removed, then reinserted it.

I doubleclicked "Start.exe"

The little white field in the front end now showed "jPortable launcher (64 bit)" as its only item.

I clicked on this item.

Result:
"jPortable launcher (64 bit) cannot be started. You may wish to reinstal to fix this issue. (ERROR: jPortable (64 bit) [https://portableapps.com/jportable] could not be found."

So I thought that maybe I should install Java through the Portable Apps front end.
I uninstalled the Java launcher, dismounted, removed and reinserted the USB drive, doubleclicked Start.exe, clicked Applications -> Add program -> JavaPortableLauncher64_3.0.paf.exe

Again exit / dismount / remove / reinsert / doubleclick Start.exe / click jLauncher... / same error message.

I read through a support document which gave "Options -> Add a new app" as a way to install new apps, so I clicked on that, and in the window that opened, searched for a jPortable Launcher (this time without 64 bit).

Same result.

ANY help would be greatly appreciated.

Jochen