Issues moving Codigniter from Windows server to Linux based server

I added the 3 missings files as empty php files and got an error, "Non-existent class: Encrypt"

system/libraries/Encrypt.php exists, but the other 3 do not.

I had a look in an archived zip: CodeIgniter_2.1.3.zip
The 3 files
application/libraries/MY_Encrypt.php <sort of expected this not to be there
application/libraries/Encrypt.php <I expected this ti be in the zip file
application/third_party/libraries/Encrypt.php <I imagine this is probably a copy of the 1 above

Where would I get these files?

Garry Cross, Web Design, Hosting & Domains
Garry Cross Personal Computers (GXPC)