Where can I find a software for XC-CPU201-EC512K-8DI-6DO?

The software for the XC-CPU201 family of PLCs is CoDeSys 2.  This will need to be purchased as part number SW-XSOFT-CODESYS-2-S from a distributor in Romania, but a DEMO version of the software can be downloaded from the link below.

CoDeSys 2 software download link

Note, you will need the original PLC configuration to go online with the PLC.  You will most likely not be able to upload the program, as most third party OEMs will disable this function to protect their Intellectual Property.  If you did not write this program, you will most likely need to contact the original equipment manufacturer to get this.