Devin Desktop has two lines - a stable one and a separate Next preview - and this is not one program with a "beta" checkbox but two different states of the product. Confusing them means applying to one what is true of the other, and then hunting for a bug that does not exist.
The naive move is to assume that since it is the same Desktop, the features, the documentation and the paths are identical, and Next is just "a little fresher." From this grows the habit of reading about a feature in one place and expecting it in another. The generalization looks harmless - after all, the application really is one - but it is exactly what leads to a technique from one line being silently applied in the other.
It breaks on the fact that the lines may differ in documentation, in registry path, and in the very behavior of features. What is described and works in Next is not considered available in stable without separate confirmation. This book even fixes a specific snapshot - stable 3.7.16 - precisely so as not to mix them: a fact from preview does not carry over to the stable line by default. The registry path here is not a detail: if the path to the extensions catalog or to the configuration differs between the two lines, then what you put there simply will not be found in the other line.
The professional move begins with treating an update as a controlled event, not a background one. Before updating, local tasks are finished or saved. In 3.7.16 this is backed by the interface itself: "Restart to Update" asks for confirmation when local agents are still working and says how many will be stopped; cloud sessions keep running meanwhile. The difference is not accidental: a local agent lives in the application and dies with the restart, a cloud one runs in its own VM and survives it.
Understanding this difference matters more than remembering the button. A local session and the application are one whole: a restart for an update cuts it off midway, and the warning about the number of agents is a chance not to lose work. A cloud session is detached from your application, so a Desktop update does not touch it. The same action, "update," has a different cost for the two surfaces, and the interface honestly shows it. From this follows a simple rule: before a restart for an update you look not at the version but at the list of active local sessions, and decide their fate deliberately.
For a team all of this stops being a personal choice. On production repositories it is reasonable to pin one update channel, agree on a short update window and run a smoke test after it. Then everyone works on one known version, updates predictably and catches a regression right away rather than a week later in the spirit of "why is mine different." A spread of versions across a team is a hidden variable that surfaces at the most inconvenient moment. A pinned channel is also a common language in bug reports: when everyone is on one version, the phrase "mine is different" points straight at configuration rather than at diverged builds.
Preview is not forbidden in all this - it just has its place. Next is convenient on a separate profile, where you can probe it without making it a hidden variable of the shared process. What is bad is not trying the new but dragging preview behavior into the shared production flow and then explaining with it discrepancies that do not exist on stable.
The cost of mixing the lines is concrete. A feature is sought in stable because it was seen in Next - and time is spent on a capability that does not exist in this line. People update in the middle of a local session, ignoring the warning - and lose the agent's unfinished work. Preview is put on a work machine as the main line - and instability is brought into the team that is hard to diagnose. Each of these costs is paid later and more dearly than a single check. What all three costs share is that they masquerade as a bug: a divergence of lines looks like a breakage, though it is merely a different layer of the product.
You should check by line and version, not by memory. Open the stable changelog and the version you run, and keep it in mind as the context of any technique from the book. Before updating, look at how many local agents will be stopped, and save their work. The engineering conclusion is simple: stable and Next are two different states, and the first question about any feature is which line and version you expect it in.
The typical failures are recognizable. "The feature disappeared" - because it is in Next while you are on stable. "The agent vanished after the update" - because the restart stopped the local session, as warned. "It works for my colleague but not for me" - because the versions diverged and the channel is not pinned. The sign is the same: no one asked about the line and version, taking a dated snapshot for eternal truth. Name the line and version first, and most of these discrepancies are explained at once.