Looks like the money grabbing nazis have stuck their boots in to stop the use of LW or limit its use.
Therefore I strongly recommend you ignore their update suggestions & stay with the version of LW you have. LW 4 does not have force update options, neither do versions 5.5.10 or earlier.
You can still use LW 5 if you downgrade back to LW 5.5.10. Basic instructions are here:
http://www.gnutellaforums.com/359411-post2.html
Recommended is
WireShare.
WireShare 5.6.3 released March 2014 is an upgrade from LimeWire Pirate Edition 5.6.2. WireShare has an inclusive installer for connection file & hostiles. WireShare includes several improvements which fix the Java 7 issue, no deletion of the connection file, & some other bug fixes & improvements.
Installers are found here:
LW installers for Windows _ and
_ LW installers for Mac OSX _ and
_ LW 5 that works for Linux.
. . . . . . . . . . . . . . . . . . LW version pirate & contrôle des liens du 02/07/2012 * Note: LW 5 will not connect without a fresh Gnutella.net file so follow those instructions.
To stop the Legal notice on start window, simply click Library tab & it will vanish.

For LW 4, simply click on the white area or do a search.
.