Hex-Rays does provide official free versions of their software, though they have limitations compared to the full "Pro" suite:
To download and install the Hex-Rays Decompiler for IDA Pro 7.0: hexrays ida pro 70 all decompilers free dow new
Released in late 2017, IDA Pro 7.0 was a landmark version that introduced a fully 64-bit architecture, significantly improving performance for analyzing large, complex binaries. Its primary strength lies in its decompilers Hex-Rays does provide official free versions of their