VERIFY install and check file sizes?
Indicates whether you want the system to perform some checks on the software you installed.

YES instructs the system to perform a checksum to confirm that your software files are the correct length, contain the correct number of digits and characters, and to verify requisites for all software on the system.

NO instructs the system NOT to check your installation. The verification process can add a significant amount of time to the installation process. If you want a faster installation procedure, choose NO.