use one License On one PC with two operastion system (7 & 10) ?

hello
i want to know that i can use one license on two operation systems ?

Afaik, you can’t.

then, must be have a licesne with two user operation ?
before this was possible ?

You always can use the free version. :wink:

License is per system.
Each OS installed in e.g. a VM is considered to be a separate system.

the free version can protect the system from the attacts of ransomware ? because this is very dangerious that my files on hard disk importatn or use internet security ?

Yep.

If the files on your hard drive are important to you, then I suggest you take action to prevent their loss from ‘any’ computer issue or malware attach.

You need to think about drive imaging software to make an exact image of your drive. Do this weekly and keep at least the last 5 backups. Ideally this drive image should be secured of the main system an external USB drive.