[Changing from multi year/multi copy to single yr/single copy KIS]

Following the expiration date, I received an activation error.  I was told by KIS support that the code I was given had already been used!  I uninstalled KIS.  Then the  company I bought it from provided another activation code that was successful following an install of the Global KIS 1 copy, 1 yr version  

[Changing from multi year/multi copy to single yr/single copy KIS]

When you say "last moment", do you mean the final day (ie expiration day - 1) ? If so, what hour of the day (and what time zone) does Kaspersky use as the expiration?   Thank you for your thoughts. 

[Changing from multi year/multi copy to single yr/single copy KIS]

I am currently running on a 10 copy, 3 year Kaspersky Internet Security license on Windows 10 that expires in 8 days.  I have purchased a 1 system, 1 year license.  What is the best way to activate this new version of KIS?