I know this is my fault for not having a backup of the files, but I wanted to just warn people to be careful with the PAF installers, as they wipe a folder before they actually install the app, as I have just found out to my cost.
I downloaded the Java Portable installer, and ran it. It detected a PAF thumbdrive in my PC, and wanted to install there. I changed the install path to a folder on my C drive. Stupidly, I told it to install to the root of that folder, and not a new folder (such as Java or similar) that the installer could create inside that folder.
After the installation, I opened the folder in my file manager, to find that the installer had wiped every file and folder I had in that folder. Yes, Java was installed there, but I am a bit upset I have lost the data in that folder.
So, fair warning to everyone - if you're installing to anything other than the PortableApps folder on your thumb drive, be very careful about what you type in the path to install field. I can only imagine the carnage had I typed in C:\ or similar...