Does the Autodesk 3ds Max installer automatically roll back to the PreviousVersion backup when a critical upgrade error occurs, or does it require user intervention?

When a 3ds Max version upgrade fails, the installer creates a ‘PreviousVersion’ backup of the prior installation and user settings. The backup can be copied manually, and the Installation Manager offers a Repair option that reinstalls the failed version while preserving scene files and custom plugins. However, the migration of UI customizations, plugin paths, and render presets writes its log to a temporary file that is deleted on success, complicating post‑failure diagnosis. Community discussions highlight an unresolved decision about whether the installer should automatically restore the PreviousVersion backup when a critical error occurs, or leave the rollback process to the user, which leads to varied recovery experiences across different system configurations.

What factors should determine if the installer performs an automatic rollback to the PreviousVersion backup, and under what conditions should it defer to user‑initiated recovery instead?