# DT4 - User-defined data fields DT3 -\> DT4

**URL:** <https://discourse.devontechnologies.com/t/dt4-user-defined-data-fields-dt3-dt4/82599>\
**Category:** DEVONthink\
**Tags:** dt4\
**Created:** [April 3, 2025, 9:04pm UTC](https://discourse.devontechnologies.com/t/dt4-user-defined-data-fields-dt3-dt4/82599 "2025-04-03T21:04:18Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![BLUEFROG](https://discourse.devontechnologies.com/user_avatar/discourse.devontechnologies.com/bluefrog/32/135_2.png) [@BLUEFROG](https://discourse.devontechnologies.com/u/BLUEFROG)\
**Post date:** [April 3, 2025, 9:17pm UTC](https://discourse.devontechnologies.com/t/dt4-user-defined-data-fields-dt3-dt4/82599/2 "2025-04-03T21:17:21Z")

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Welcome @LRS77

1. Quit DEVONthink.
2. In the Finder, hold the **Option** key and choose **Go \> Library**.
3. Go into the **Application Support/DEVONthink 3** directory and copy the **CustomMetadata.plist** file into the **DEVONthink** directory in App Support.
4. Launch DEVONthink 4.)

PS: Did you read this…

> [@READ ME – Running the DEVONthink 4 Trial](https://discourse.devontechnologies.com/t/read-me-running-devonthink-4-beta/82600/):
>
> Read this if you want to run a trial of DEVONthink 4… Firstly… DEVONthink 3 and 4 should not be available to run on the same account, on the same Mac. Optimally, DEVONthink 4 should be installed on a separate macOS user account in its own ~/Applications directory to isolate it from other user accounts. However, if you want to run DEVONthink 4 and use it with your DEVONthink 3 databases, you need to make sure version 3 can’t be launched. In the Finder, locate the DEVONthink 3 application. Con…

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