Help with Pastebin

I have created a pastebin OS downloader, but I can't get the shell to work.
Here's my code.

print("Welcome to wolfie.com/oswolf.html!")
print("Enter a OS name.")
print("The OSes we have are:")
local oses = "LyqydOS, CraftoidOS, PearOS, RedOS, TungstenOS, NexOS, AquaOS, KrussOS, LeadlinedOS, Jupiter, VoidOS, Extended Shell, CannonOS, FlowOS, HdOS, MarMarOlive, SkyOS"
print(oses)
input = read()
local os = string.lower(input)
if os == "lyqydos" then
pc = WmFHmuZq
elseif os == "craftoidos" then
pc = FgJszA48
elseif os == "pearos" then
pc = LRFsvuN3
elseif os == "redos" then
pc = "iFqHK3a"
elseif os == "tungstenos" then
pc = F8GjuMf1
elseif os == "nexos" then
pc = H7ZQtZ43
elseif os == "aquaos" then
pc = E8qbntaA
elseif os == "krussos" then
pc = ya45RM32
elseif os == "leadlinedos" then
pc = "8a56FiF"
elseif os == "jupiter" then
pc = WQX8hhYk
elseif os == "voidos" then
pc = a9Q45w5L
elseif os == "extendedshell" then
pc = tQutzmaX
elseif os == "cannonos" then
pc = vs6vcFvF
elseif os == "flowos" then
pc = ZsyCFtWr
elseif os == "hdos" then
pc = w3gwbP5R
elseif os == "marmarolive" then
pc = rGN6L97Y
elseif os == "skyos" then
pc = VUc0PdRa
else
print("Incorrect input.")
end
shell.run("pastebin", "get "..pc.." installer")
print("Downloaded "..os)
print("Run installer to install "..os)

Any help?

your [pastebin] codes have to be strings.

[The first part of your post was complete nonsense and incorrect. I was going to delete it, but you had some good information on the last line, so I've kept that. -L]