# FontBase Plugin not recognized by InDesign

**URL:** <https://forum.fontba.se/t/fontbase-plugin-not-recognized-by-indesign/2013>\
**Category:** Questions\
**Created:** [September 25, 2026, 2:38am UTC](https://forum.fontba.se/t/fontbase-plugin-not-recognized-by-indesign/2013 "2026-09-25T02:38:19Z")\
**Posts on this page:** 3\
**Page:** 1

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**Author:** ![theprintress](https://forum.fontba.se/letter_avatar_proxy/v4/letter/t/13edae/32.png) [@theprintress](https://forum.fontba.se/u/theprintress)\
**Post date:** [September 25, 2026, 2:38am UTC](https://forum.fontba.se/t/fontbase-plugin-not-recognized-by-indesign/2013/1 "2026-09-25T02:38:20Z")

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Every time I open InDesign (Version 21.6) I get  
Adobe InDesign does not recognize

FONTBASE-WIN-INDESIGN-2026.PLN as a valid plug-in. Please reinstall the FONTBASE-WIN-INDESIGN-2026.PLN plug-in and restart InDesign.  
FontBase: 2026.6.0, Client: df562ad1-9276-4864-b818-86f123e70fe3

Windows11

I tried going to settings and removing the plug-in and then change… and putting it back in the Plug-In folder in InDesign, but that has not solved the problem. And now my Plug-In folder looks different than it did before. Before It only had the .PLN and now it has a new folder (FontBase-Win-InDesign-2026 Resources) that I cannot delete. I don’t know what to do.

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**Author:** ![yuriy](https://forum.fontba.se/letter_avatar_proxy/v4/letter/y/ea666f/32.png) [@yuriy](https://forum.fontba.se/u/yuriy)\
**Post date:** [September 25, 2026, 11:51am UTC](https://forum.fontba.se/t/fontbase-plugin-not-recognized-by-indesign/2013/2 "2026-09-25T11:51:12Z")

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Hello @theprintress, thank you for your post and welcome to the forum 🙏

Have you perhaps seen this similar topic here on the forum with a potential solution?

> [@InDesign plugin not valid after 21.5.1 update](https://forum.fontba.se/t/indesign-plugin-not-valid-after-21-5-1-update/2002):
>
> After InDesign is updated to 21.5.1 the FontBase plugin isn’t loading with the error message: Adobe InDesign does not recognise FONTBASE-WIN-INDESIGN-2026.PLN as a valid plug-in. Please reinstall the FONTBASE-WIN-INDESIGN-2026.PLN and restart InDesign. Windows 11 25H2 26200.9168 FontBase 2026.5.23

Thank you again,

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**Author:** ![theprintress](https://forum.fontba.se/letter_avatar_proxy/v4/letter/t/13edae/32.png) [@theprintress](https://forum.fontba.se/u/theprintress)\
**Post date:** [October 17, 2026, 8:16am UTC](https://forum.fontba.se/t/fontbase-plugin-not-recognized-by-indesign/2013/3 "2026-10-17T08:16:27Z")

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Yes, I have seen this post, but it did not solve my problem. Reinstalling via the FontBase settings page did not help. Any other suggestions?  
App version FontBase: 2026.7.0, Client: df562ad1-9276-4864-b818-86f123e70fe3  
InDesign Version 21.6 x64  
OS (C:) \> Program Files \> Adobe \> Adobe InDesign 2026 \> Plug-Ins \> FontBase-Win-InDesign-2026 \> FontBase-Win-InDesign-2026.pln