v3.4 relied on unsigned kernel drivers. When Windows 8 and 64-bit Windows 10 became standard, Microsoft blocked unsigned drivers forcefully (PatchGuard). To use v3.4, users had to keep a legacy Windows 7 32-bit dual boot.
The RealFlight G5 dongle emulator V3.4 can be downloaded from various online sources. However, users are cautioned to ensure that they download the emulator from a reputable source to avoid any malware or viruses. realflight g5 dongle emulator v3.4