Hello Vlad
You can find information on Spectrum Upgrades here:
Upgrading CA Spectrum - CA Spectrum - 10.1 to 10.1.2 - CA Technologies Documentation
In order to install an upgrade/patch, the base version needs to be installed first. Thus in your case 10.1.0 must be installed prior to 10.1.1
is 10.1.0 already installed?
Would also recommend to check and make sure there are on "Spaces" in the path for installing Spectrum. Default directory is C:\win32app (Win) or /opt/Spectrum (Linux)
Also make sure AntiVirus is disabled. A/V will block installation.
Regards,
~Jay V