Yes. Make sure the pack is selected in the launch screen, and then look at the tabs over the window showing the pack details.
The right-most tab is labelled "Packcodes". To the immediate left is a droplist that probably shows as "Recommended". Hit the drop arrow and you can select older versions, and even newer versions than the current "Recommended" if there are betas available. The current recommended version is listed in the pack selection window on the left, btw.
Select the version that's on your server, and you should be ok after it reloads.