I have a similar problem, only blogger generates a 90+ MB file.
The blogger importer says that it has a 20 MB limit, AND it says that it’s not been tested on my version of WP.
When I try to import, first I get the error messages at the top of the page:
Warning: Declaration of WP_SimplePie_Blog_Item::get_id($hash = false) should be compatible with SimplePie_Item::get_id($hash = false, $fn = 'md5') in /htdocs/userdirs/msaroff/40years/wp-content/plugins/blogger-importer/blogger-importer-blogitem.php on line 111
Warning: Cannot modify header information - headers already sent by (output started at /htdocs/userdirs/msaroff/40years/wp-content/plugins/blogger-importer/blogger-importer-blogitem.php:25) in /htdocs/userdirs/msaroff/40years/wp-includes/functions.php on line 6360
Warning: Cannot modify header information - headers already sent by (output started at /htdocs/userdirs/msaroff/40years/wp-content/plugins/blogger-importer/blogger-importer-blogitem.php:25) in /htdocs/userdirs/msaroff/40years/wp-admin/includes/misc.php on line 1310
Warning: Cannot modify header information - headers already sent by (output started at /htdocs/userdirs/msaroff/40years/wp-content/plugins/blogger-importer/blogger-importer-blogitem.php:25) in /htdocs/userdirs/msaroff/40years/wp-admin/admin-header.php on line 9
And when I try to run the import anyway, it’s an WP installation on Panix.com, I get, after a long delay, this message:
504 Gateway Timeout
The gateway did not receive a timely response from the upstream server or application.
Given that I’ve been on blogger since 2007, 24407 posts, I do understand that my predicament is an outlier.