Thank you for bringing this to my attention.
There is a problem with the links in the customer portal section of the website.
They point to a separate .exe download then the public download page.
Unfortunately the files (FlashFXP50_Setup.exe, FlashFXP50_Portable.exe, FlashFXP50_U3_Portable.exe) all ended up as the U3 setup.
Further research has revealed that a regression flaw in the FlashFXP raw commands introduced this problem.
I use a raw command to strip the build # from the local file when queuing the file for upload
Code:
/queue selected $replacerx("%f", "^(\w{10})_([0-9]{4})_(.*)$","\1_\3")
This is broken in builds 3771 to 3773, and now fixed in 3774.
It will be a few days before I can get everything sorted out, I have a hard drive on my main development computer starting to fail and I'm in the process of testing the new drive and then if all goes well migrating the data.