MultiBit Classic is still available on the multibit.org site.
If you click on the Downloads link and look at the bottom of the 'Releases and signatures' there is a link to take you to the MultiBit Classic downloads.
We expect to support MultiBit Classic for quite a while.
Hi, Jim.
I hate to be a pain, but do you (or someone at Bitcoin Solutions) plan to re-sign the Windows 0.5.18 binaries sometime in the future to fix
this certificate expiration issue?