Upgrader issues

Fatal error: Allowed memory size of 33554432 bytes exhausted (tried to allocate 2355240 bytes) in /home1/worldre2/public_html/travel/wp-includes/http.php on line 1327

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I tried to use the internal upgrader to change my files over to the 2.8.6. version, but it seems that 2MB is larger than the website will allow a file downloaded to be.