I am trying to install SEP client 12.1.4 (single exe exported from SEPM 12.1.5) on windows 7 pc and getting the below error,
Exported one more single exe(12.1.4) again from SEPM then tried still the same issue. (SEPM is running 12.1.5)
Have you try to check after clean wipe tool ?
Install an unmanaged AV only client. If that works, make it managed and add whatever other components you need.
Run cleanwipe..
Download an unmanaged client from fileconnect and install