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Thunderbird add on V1.2.0pre2 for Manually sort folders says it's corrupt and won't download?

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  • Last reply by sfhowes

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When I click on the downloaded file: file:///C:/Users/Owner/Downloads/manually_sort_folders-1.2.1-tb.xpi a message pops up saying 'This add on could not be installed because it appears to be corrupt.

When I click on the downloaded file: file:///C:/Users/Owner/Downloads/manually_sort_folders-1.2.1-tb.xpi a message pops up saying 'This add on could not be installed because it appears to be corrupt.

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ps- I'm using ver. 60.6.1 for Thunderbird and 66.0.5 for Firefox

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If you've downloaded the xpi file, open Tools/Add-ons/Extensions in TB, click the gear icon next to Search, Install Add-on from File, select the xpi file. Or, drag the xpi file and drop it onto Tools/Add-ons/Extensions.