# How to revert back to a 2018 license **URL:** \ **Category:** SketchUp\ **Tags:** license\ **Created:** [May 26, 2020, 1:56pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559 "2020-05-26T13:56:02Z")\ **Posts on this page:** 8\ **Page:** 1
**Author:** ![AIG](https://avatars.discourse-cdn.com/v4/letter/a/3be4f8/32.png) [@AIG](https://forums.sketchup.com/u/AIG)\ **Post date:** [May 26, 2020, 1:56pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/1 "2020-05-26T13:56:02Z")
Hi, We use a 2018 version of SketchUp in our company, wich is the only version compatible with a specific software (Trimble Scan Explorer). Our active license is now the 2019 version, we automatically update, but now we can’t go back to 2018 version with ou 2019 serial license. How can we downgrade and obtain a 2018 license ? We purchased our perpetual license in 2018 so our maintenance & support license is expired. Thank you for your help ---
**Author:** ![SketchUp3D\_de](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/sketchup3d_de/32/167_2.png) [@SketchUp3D\_de](https://forums.sketchup.com/u/SketchUp3D_de)\ **Post date:** [May 26, 2020, 3:56pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/2 "2020-05-26T15:56:29Z")
you cannot activate an **old** license on a **new** system once a more recent version was activated already. Existing program installations of old versions already activated **before** activating a new version are not affected, i.e. can be used further. If a fallback to an old version because of e.g. an old plugin or operating system is required, the acitvation of the new version needs to be deactivated. Contact the supplier of your license for further information concerning this process. ---
**Author:** ![AIG](https://avatars.discourse-cdn.com/v4/letter/a/3be4f8/32.png) [@AIG](https://forums.sketchup.com/u/AIG)\ **Post date:** [May 27, 2020, 6:19am UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/3 "2020-05-27T06:19:30Z")
Thank you for your answer. The problem is we can’t contact SketchUp maintenance because our support is expired. Do you know how to contact them without purchasing a new maintenance & support license ? ---
**Author:** ![colin](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/colin/32/70101_2.png) [@colin](https://forums.sketchup.com/u/colin)\ **Post date:** [May 27, 2020, 6:36am UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/4 "2020-05-27T06:36:54Z")
That part is debatable. There are sometimes cases where we are the only people who can fix an issue, and so I did answer your support message from Tuesday morning. I sent my reply in the morning my time, with your now-should-be-working 2018 license. Look for a message from [prosupport@sketchup.com](mailto:prosupport@sketchup.com). ---
**Author:** ![colin](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/colin/32/70101_2.png) [@colin](https://forums.sketchup.com/u/colin)\ **Post date:** [May 27, 2020, 2:25pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/5 "2020-05-27T14:25:32Z")
It looks like you haven’t replied to my support email yet, or come back since I posted last night. I will tag you, in case that makes the post standout better. @AIG ---
**Author:** ![AIG](https://avatars.discourse-cdn.com/v4/letter/a/3be4f8/32.png) [@AIG](https://forums.sketchup.com/u/AIG)\ **Post date:** [May 27, 2020, 3:04pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/6 "2020-05-27T15:04:50Z")
I’ve seen your email today and now everything is working successfully, thank you very much Colin for your help ---
**Author:** ![colin](https://sea2.discourse-cdn.com/sketchup/user_avatar/forums.sketchup.com/colin/32/70101_2.png) [@colin](https://forums.sketchup.com/u/colin)\ **Post date:** [May 27, 2020, 4:46pm UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/7 "2020-05-27T16:46:17Z")
Great, thanks for the update. ---
**Author:** ![system](https://global.discourse-cdn.com/sketchup/original/3X/f/2/f2a121500b085ed60806607a82720b092d800bb3.png) [@system](https://forums.sketchup.com/u/system)\ **Post date:** [November 27, 2020, 12:46am UTC](https://forums.sketchup.com/t/how-to-revert-back-to-a-2018-license/126559/8 "2020-11-27T00:46:37Z")
This topic was automatically closed 183 days after the last reply. New replies are no longer allowed.