El Capitan installation problem
I am unsuccessfully trying to reinstall El Capitan on my 10 years old MacBookPro(15in). In the middle of installation it says "OS X could not be installed on your computer. No packages were eligible for install. Contact the software manufacturer for assistance...". I erased the HDD, changed to SDD- tried to install from internet and from created external drive. Always the same message "OS X could not be installed on your computer. No packages were eligible for install. Contact the software manufacturer for assistance..."
Thank you in advance for help.
MacBook Pro 15", OS X 10.11