Step7_v5.6.iso Unpacked from original SIMATIC_STEP7_V56.exe and packed to ISO for Virtual DVD (UltraISO) disk
SIMATIC_STEP7_V56.exe original package from Siemens site - see and compare checksum
SIMATIC_S7GRAPH_V56.exe https://support.industry.siemens.com/cs/document/109748125/where-do-you-procure-the-current-trial-software-for-simatic-s7-graph-v5-6
SIMATIC_S7SCL_V56.exe https://support.industry.siemens.com/cs/document/109748118/where-do-you-procure-the-current-trial-software-for-simatic-s7-scl-v5-6
PLCSim_v5.4_SP8.zip Part of TIA Portal package