You have to download these files:

http://simptoms.narod.ru/S7PLCSim/Instr.rar (0.6 KB)
http://simptoms.narod.ru/S7PLCSim/simsam.pdc (4.13 MB)
http://simptoms.narod.ru/S7PLCSim/simsim.plc (4.54 MB)

After download open archive Instr.rar and run Instr.bat.
After this operation you can select destination folder to extracting installation for s7plcsim52 :).

Lekarstvo dlja s7plcsim52:
http://simptoms.narod.ru/S7PLCSim/simsimdrug.rar