Try this  Lite version  if the Full version  is too much for your  machine:
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EXPRESII Lite   for Windows
 
Compared with the Full version, Lite version is:
  • Without   dispersion 
  • One color per layer 
  • Single paper material
Available as  Public Preview:
Above is a sample  work done in Lite version showing you want we mean by 'single-color-per-layer'.
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If the installer doesn't work for you, try this   Zip Package .