I'm having problems getting this to run.
I've installed jailbreak provided by op's link, installed Launchpad, and then...
1. Create folder "customupdates" on root of Kindle
2. Copy kindlepdfviewer-master.zip to customupdates and unzip.
Now within customupdates folder there is kindlepdfviewer-master.zip and kindlepdfviewer-master > kindlepdfviewer-master > files.
Eject, press Shift-Shift-I and 'Success' message is displayed. I then press Shift-Shift-Space and again receive 'Success' message. Finally I press Shift-P-D but nothing happens?
Where am I going wrong please?