All of the Trimble products (including SketchUp) are managed by the Trimble Account Management Portal (AMP). You access your AMP with your Trimble ID. So until you set your ID, you won't be able to access any of your prouducts.
Warning about Browsers: Please don’t use Microsoft Internet Explorer and Microsoft Edge browsers when accessing the Account Management Portal, as it won’t work well. We recommend using Google Chrome or Firefox (some others work fine as well).
Please note that your AMP access and contents may be slightly different based on where and how you purchased your subscription, depending on who you purchased it from.