This license allows you to own the software "forever". It is identified by a serial number typically starting with "UA-" and an accompanying authorization code. While you can use this version indefinitely on compatible hardware, Trimble officially discontinued selling new Classic licenses on November 4, 2020 .
If you were a student in 2019, you might have a 1-year educational license. These are non-transferable and cannot be used commercially. Do not buy "student keys" for business use. sketchup pro 2019 license
SketchUp Pro 2019 stands at the crossroads of this transition. This license allows you to own the software "forever"