WordPress.org

1. 4arter
   Member
   Posted 2 months ago #
   

   I tried both the automatic install and uploading the zip. Neither worked with WP 3.5.1 "does not have a valid header".

   http://wordpress.org/extend/plugins/all-in-one-event-calendar/

2. malkieh
   Member
   Posted 2 months ago #
   

   There are fixes for this posted posted on this forum if you search.

3. nathair
   Member
   Posted 2 months ago #
   

   One fix here http://wordpress.org/support/topic/the-plugin-does-not-have-a-valid-header-23?replies=5

4. cdickman
   Member
   Posted 2 months ago #
   

   I had the same thing happen on my multi-user site. Could that be the case for you? I was able to go to the single site I wanted it on and activate it there, with no problem.

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