We're calling on all EU-based Mozillians with iOS or iPadOS devices to help us monitor Apple’s new browser choice screens. Join the effort to hold Big Tech to account!

This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Avatar for Username

ابحث في الدعم

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

This thread was archived. Please ask a new question if you need help.

Error after Update of 19 DEc 2021

  • 2 (ردّان اثنان)
  • 1 has this problem
  • 12 views
  • آخر ردّ كتبه Wayne Mery

frederica.bull
frederica.bull
more options

I had an automatic update for Thunderbird on 20 Dec. I cannot open the program now. I get an 

          Error; Platform version 9.4.0 not compatible with 91.4.0

What can I do? The troubleshooter says incompatible. Many thanks Frederica.bull@btinternet.com

I had an automatic update for Thunderbird on 20 Dec. I cannot open the program now. I get an Error; Platform version 9.4.0 not compatible with 91.4.0 What can I do? The troubleshooter says incompatible. Many thanks Frederica.bull@btinternet.com

All Replies (2)

Wayne Mery
Wayne Mery
  • Moderator
  • Top 10 Contributor
more options

Can you provide the full+exact error, maybe with filename and line number, or a screenshot of the error?

Modified by Wayne Mery

Wayne Mery
Wayne Mery
  • Moderator
  • Top 10 Contributor
more options

Also, try reinstalling by downloading from https://www.thunderbird.net/