Our current release of NinjaTrader supports a 32-bit OS.
NinjaTrader Installation Guide
Do you have another PC running 32 bit that you can install NinjaTrader on until NinjaTrader 7 is available to the general public?
NinjaTrader 7 will officially support 64 bit Operating Systems. I have provided a link below to the public announcement of NinjaTrader 7 which includes a section that goes over new features, improvements and release information.
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