Windows 10 is coming out soon...zomg. I know some of you eager beavers may decide to get your free OS and continue to use Unity ASAP, so please keep this in mind when installing Windows 10. Back up your projects, for the love of everything just always do that always forever for no particular reason other than you should just do it. Ok we good... let's get on to.. Licenses If you have a Pro license you may be familiar with the amount of activations you have, if you're not then get real familiar right now. Pro license keys come with two activations as default, meaning you can install it on two machines. If you have NOT reached the limit of your activations (i.e. 1/2), you can ignore all this and move on with your life. Unity will detect the change in OS and return your activation automatically. If you have reached your activation limit (i.e. 2/2) FEAR NOT, you can reset them yourself in the editor (before you upgrade OS) or in your store account. When you get to the welcome screen just reactivate your Pro license. Personal users won't need to re-activate so don't worry, but it's possible ALL users may have to sign in again on the Welcome Screen again. TO RETURN AN ACTIVATED LICENSE VIA YOUR UNITY ACCOUNT Go to the Unity Store: https://store.unity3d.com/ Click "My Account", then sign in to the account which is linked to the license. Or, if you haven’t assigned your license yet, click Add License. Click "Activations" Click "Disable all activations" on the license added. MANAGING YOUR UNITY 5 LICENSE With Unity 5 you are able to manage your license independently. Below is a guide to how this system works and performs. In the Unity drop-down on your toolbar there is an option called “Manage License…”. This is the unified place within the Editor for all your licensing needs. Once you have clicked on the “Manage License…” option you will be faced with the “License Management” window. You then have four options, explained below: “Check for updates” cross-references the server, querying your Serial number for any changes that may have been made since you last activated. This is handy for updating your license to include new add-ons once purchased and added to your existing license via the Unity Store. “Activate a new license” does what it says on the tin. This enables you to activate a new Serial number on the machine you’re using. The “Return license” feature enables you to return the license on the machine in question, in return for a new activation that can be used on another machine. Once clicked the Editor will close and you will be able to activate your Serial number elsewhere. For more information on how many machines a single license enables use on, please see our Licensing and Activation FAQ. “Manual activation” enables you to activate your copy of Unity offline. This is covered in more depth above. More information on license activation here https://unity3d.com/unity/activation If things seem beyond all hope or repair with your license, contact email@example.com Technical issue or bug with Unity on Windows 10? We expect everything to be spiffing but in the event of an emergency report report report and report And if you've created a forum thread about it, tell us your bug number, it helps us a lot. Please keep posts in this thread to license issues! If you have a different problem regarding Unity and Windows 10, create a new thread and you can link to it here so we can see it but don't discuss it here.