Windows
Close SketchUp if it’s opened.
Open a new Windows Explorer window.
Navigate to C:\ProgramData\SketchUp\SketchUp 2015
Right-click on the SketchUp.lic license file and select Open.
Click the button for “Select a program from a list of installed programs” and then click OK.
Select Notepad then click OK.
Add the text ##NoTrial to the top line in the license file. See the image below
Click File > Save.
Close Notepad.
Open SketchUp Make 2015.
Accept the Terms of Use agreement in the Welcome Window.
Start using SketchUp.
MAC
Close SketchUp if it’s opened.
Open a new Finder window.
Click Go in the top menu bar.
Select Go to Folder…
Enter the path ~/Library/Application Support/SketchUp 2015/
Right-click on the SketchUp.lic license file and select Open With… > Other.
Select TextEdit then click OK.
Add the text ##NoTrial to the top line in the license file. See the image below
Click File > Save.
Close TextEdit.
Open SketchUp Make 2015.
Accept the Terms of Use agreement in the Welcome Window.
Start using SketchUp.