Why to Windows 10?

Win 7 support ends -- Microsoft ends mainstream support for Windows 7.
Free upgrade -- Windows 7/8.1 users can upgrade to Windows 10 for free within one year.
Amazing new features -- 1. Cortana, 2. Microsft Edge, 3. Xbox streaming, ...

How to upgrade?

Don't like Windows 10 -- How to recovery to the previous operating system if Windows 10 isn't right for you.
Data loss -- Almost 89% users lost important or not so important data after the system upgrade.
Lack of disk space -- New powerful Operating system always needs more space, maybe there is no enough free space for Windows 10.
Large data transfer -- Also upgrade computer, you must have numerous files and applications to transfer.

Before upgrade

Backup up old operating system and important data in case any unpredictable issues happen.
Make sure the partition used to install Windows 10 has enough space, if not, extend partition.

After upgrade

Transfer useful data and applications to the new computer if you also replace computer.
Backing up new system and important data regularly is a good habit to make life easy.
Don't like Windows 10, go back to previous operating system with Qiling Disk Master. Make sure you have backed up OS before the upgrade