Unfortunately the answers are what I expected. Below are the ones that I have received:
WF5 is not supported in 3.x.
Upgrade to 9.x is required.
WF5.0 is not supported for IL 3.4. Last support is WF4.0 with IL 3.4 M70 if you wanna pay PTC extra for it. Otherwise you need to upgrade.
There is no support for WF5 on Intralink 3.4. Page 5 of this document
P Before printing, think about the environment.