I had similar Error message when i tried to install the program:
“ERROR – DocuCan 1.6.0 is not allowed to run on Win 8.1 -Setup Aborted ! ”
I use Windows 10 (32Bit).
I had copy and save the DocuCan.exe 75,8 MB (79.542.328 byte) from “your username/AppData/local/Temp” folder that the SharewareOnSale_Giveaway_Aug-4-2016_DocuCan_hub.exe place it temporary to some other folder and tried to install it again but same error msg appeared.
So I downloaded the Trial Version (32bit) of the program { DocuCanWin32.exe } from it site http://www.docucan.co.uk/ which it had diffrent size 72,3 MB (75.858.680 byte) and i install and register it with the given key. That worked.