Here is an example (I just posted elsewhere) of some information that belongs in pinned post:
To upgrade Pro licenses for SketchUp:
Go to the SketchUp Licensing Troubleshooter webform, and:
(1) choose “Yes, I have purchased a license.” to the first question,…
(2) choose “I would like to upgrade my license.” to the second question.
Follow the instructions.
To download new installers for SketchUp:
(1) Determine the latest version that your hardware can support:
(2a) Go get that version, and choose your language in either the Pro (last 3 version) or Make (current version only) edition:
(2b) If you need an old version of SketchUp Make for an old platform or OS:
**[u]To upgrade Pro licenses for SketchUp[/u]:**
Go to the [**SketchUp Licensing Troubleshooter**](http://help.sketchup.com/en/article/1205653) webform, and:
**(1)** choose "**Yes, I have purchased a license.**" to the first question,...
**(2)** choose "**I would like to upgrade my license.**" to the second question.
**Follow the instructions.**
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**[u]To download new installers for SketchUp[/u]:**
**(1)** Determine the latest version that your hardware can support:
* [SketchUp Hardware and software requirements](http://help.sketchup.com/en/article/36208)
**(2a)** Go get that version, and choose your language in either the **Pro** (last 3 version) or **Make** (current version only) edition:
* [SketchUp Product Downloads - All](http://www.sketchup.com/download/all)
**(2b)** If you need an old version of **SketchUp Make** for an old platform or OS:
* [SketchUp Make **2015** EN Download Links](http://forums.sketchup.com/t/where-can-i-download-sketchup-make-2015-for-mac-os-x-10-11-2/19195/4)
* [SketchUp Make **2014** EN Download Links](http://forums.sketchup.com/t/sketchup-make-2014-download-links-provided-here/11472)