There are modified "MVCI Driver for Toyota Techstream" files floating around automotive forums that have been hacked to work on 64-bit Windows.
Both x32 and x64 are supported, though x64 requires a manual installation workaround. A Mini VCI J2534 cable (often found on 3. Step-by-Step Installation Guide (64-bit Fix) mvci driver for x32 64 os multi version free
Some multi-version packs incorrectly bundle the architecture. Solution: Ensure your driver pack explicitly contains separate folders: x86 (for 32-bit) and x64 (for 64-bit). Do not mix them. There are modified "MVCI Driver for Toyota Techstream"