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The freeware version of IDA v7.0 comes with the following limitations:

no commercial use is allowed
lacks all features introduced in IDA > v7.0
lacks support for many processors, file formats, etc…
comes without technical support

SHA1 checksums:

85b6db8d26be2560ed9b1ac4228fe2366a9e5453  idafree70_linux.run
fc188886e174b2adc2d37c0df2858f0e192af7e1  idafree70_mac.zip
38b41baf3dd60dba67a7e656c5e5beb2d4a0adca  idafree70_windows.exe

IDA Freeware for Windows (59MB)

IDA Freeware for Linux (46MB)

IDA Freeware for Mac (44MB)

IDA Freeware Download Page