The software is in split rar files and the driver is in a single rar file. To install the driver (32bit Win 7 OS only), copy the contents of the rar file to a directory. Plug in the IShow DAC. Let it install as an unrecognised device. Go to device manager and find the device. Choose upgrade driver and open the directory you saved the files in. As it installs you will get a message that the driver is uncertified. Click on install anyway. Software should see the DAC now.
It is possible to install Win7 32bit as a virtual machine on a 64bit Win 7 PC (I've done it but you need a separate licence!) and the DAC will work. However there is the possibility of latency issues.
I just uploaded my whole ishow drivers directory in one zip over on another thread where I had copied/quoted this post of yours WolfMax, I DO believe that it contains what was in your link. Hopefully he is patient and did not give up... yet.