NVDA version compatibility

buildVars.py declares addon_minimumNVDAVersion = "2026.1" and addon_lastTestedNVDAVersion = "2026.1". tests/test_buildvars.py keeps the two in sync and well-formed:

The floor comes from a real runtime dependency, not an aspirational target: the bundled dengjen-tts-grpc.exe binary needs NVDA’s Python 3.13 64-bit runtime, a requirement in place since v3.2-beta.1. See Requirements and Container for how that subprocess is launched.

The v4.0.1 changelog documents a correction, not a new restriction: the add-on previously declared support for NVDA 2025.1+, but any NVDA older than the Python 3.13 switch failed to load the driver with an ImportError. minimumNVDAVersion was corrected to 2026.1 to match the runtime the bundled engine actually requires, rather than leaving users on older NVDA releases to hit that failure at load time.

Change addon_minimumNVDAVersion and/or addon_lastTestedNVDAVersion in buildVars.py — CLAUDE.md’s guardrails call for configuring through `buildVars.py before modifying sconstruct directly. Bump lastTestedNVDAVersion whenever a new NVDA release has been verified, even when the minimum doesn’t move; test_buildvars.py fails the build if lastTested ever drops below minimum.

The Microsoft Visual C++ 2015-2022 Redistributable requirement (Requirements) is a separate, OS-level dependency of the bundled MSVC-built speech engine — it isn’t gated by NVDA’s own version and applies regardless of which NVDA release is running.

pytest tests_e2e/ drives a full, real NVDA install end to end via nvda-addon-testkit — installing the built add-on, working through its no-voice modal, downloading a real voice, and speaking with it. It’s CI-only: it needs the e2e job’s provisioned NVDA and requirements-test-e2e.txt, and isn’t meant to be reproduced on a personal machine.

Troubleshooting covers the symptoms of an incompatible NVDA/runtime pairing — the driver missing from NVDA’s synthesizer list, or failing to load.