Long story short, I formatted my PC without uninstalling anything from it. Now when I try to install Kaspersky, it demands an activation code. Which I thought I managed to find, but it won't accept it.

My OS is Windows 10 version 22H2 (OS Build 19045.2965).
I have a Kaspersky Plus subscription for 1 unit.

What I suspect is happening is that Kaspersky doesn't realise I formatted my PC and thinks I'm still running it on the now nuked installation. But I do not know for sure

Disconnect your device from your account on My Kaspersky.

After that, try to activate the application on your PC again.

It’s likely that Kaspersky still sees your previous (now formatted) installation as the active device. Since you have a 1-device license, it won’t allow activation on the new system unless the old instance is removed from your account.

Here’s what you can do:

1. Log in to your My Kaspersky account at https://my.kaspersky.com
2. Go to "Devices" or "Subscriptions"
3. Locate the old device (it may show as offline or unnamed)
4. Remove or disconnect it from your account
5. Once removed, try installing and activating Kaspersky again on your current system using the same activation code

If that doesn't work, contacting Kaspersky Support directly with your license details should help, they can manually reset the license or unlink the old installation.

@Kafluffle Welcome,

Also , after disconnecting your device on My Kaspersky :

1. Go to  https://my.kaspersky.com/MyLicenses#/portal/pages/licenses/details/    
2. Click on 'Download'

When the download is finished  your Kaspersky version  will automatically be installed and activated.