Take you files with you.
I took the lead from Abraham Lee. Works on 4 computers. Windows 10. I did this:
I installed LilyPond 2.19.83 and Frescoboldi 3.1.1 on one computer.
Download openLilyLib (part I use)
On a stick I made a Programs folder (root is OK)
I copied the 3 folders above to the Programs folder.
I made a Frescoboldi shortcut on the stick root directory.
I also made one for the computer desktop. (if you like)
For each remaining computer i took the stick and:
I made Frescoboldi shortcut on the stick root directory for that computer.
The short cut that you use for that computer will show the Lily
(if a computer is similar a common short cut may work, You will now if you see a Lily on one)
I have 4 computers and 3 shortcuts on my root directory for the 4 computers.
I also made one for each desktop. (if you like)
So far it works! Be patient for Frescoboldi to load the first time or you may open several copies.