Now go draw a line. It will be perfectly straight. And Wacom will never know you exist. P.S. If you are on a Mac with an M1/M2/M3 chip and you want to save yourself the headache, just buy a used 2015 Intel MacBook Air. Keep it offline. Use it exclusively for the CTL-671. This is your life now.
You typed into Google.
Congratulations. You haven't just searched for a piece of software. You have initiated a rite of passage. You have decided to keep a zombie alive.
The Wacom CTL-671 (often lumped into the One by Wacom or Bamboo Pen lineage) is the AK-47 of drawing tablets. It has no buttons (okay, maybe two). It has no touch ring. It has no screen. It weighs nothing, feels cheap, and will survive a nuclear blast. It is the tablet that taught a generation of illustrators how to draw without looking at their hands.
You are keeping a piece of hardware alive that the industry has declared dead. You are using a pen that has no battery, a surface that has no texture, and a driver that has no bloat.
You want version 5.3.5-3 or 5.4.3-2 . (Anything before the "6.0" overhaul). For Mac: You want version 6.3.46-2 . (The last stable build before Apple’s notarization requirements broke everything).
It works.