
LookOut add-on won't install
After downloading LookOut, I'm told it can't be installed because it appears to be corrupt.
Chosen solution
It looks like you're clicking on the Download button and trying to install in Firefox. Drag the green Download Now button and drop it onto Tools/Add-ons in TB.
https://support.mozilla.org/en-US/kb/installing-addon-thunderbird
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Did you remove the old version before installing the fixed version? What is your version of TB?
I have TB 68.10.0 (64bit). I'm not aware of having an old version installed. I didn't know about LookOut before yesterday.
For TB 68, install v. 2.04:
https://addons.thunderbird.net/en-US/thunderbird/addon/lookout-fix-version/versions/2.0.4
It could not be installed because it can't be verified.
edit: it has not been verified
Chosen Solution
It looks like you're clicking on the Download button and trying to install in Firefox. Drag the green Download Now button and drop it onto Tools/Add-ons in TB.
https://support.mozilla.org/en-US/kb/installing-addon-thunderbird
I was unable to complete drag and drop between the two windows. I took the other option given in the link. I saved the Download link to my computer, then installed it in Thunderbird. It seems to be installed. Do I need to do anything else to have it running? Can I expect future attachments that would otherwise have said "winmail.dat files can't be opened" to now open? Thank you for your help.
As I recall from using it once to decode a winmail.dat attachment, it makes such attachments appear as regular files with the underlying extension.