The link.vex.com redirect site seems to be down at the moment (503 service unavailable). I verified this by attempting to access my link.vex.com bookmark of the Tower Takeover game manual, by clicking the link to the same document found on this page, and via down for everyone or just me.
Seems like it was only a short outage. The link to the game manual (https://link.vex.com/docs/vrc-tower-takeover/TowerTakeover-GameManual) seems to be working now.
Cool, working for me now as well. Guess I was in the right place at the right time.