Marketpress single site 2MB upload limit

Trying to set up a digital downloads store in MP.

Surprised that there's a 2MB limit on media uploads. My average audio file size is around 12MB.

I need to increase this limit. Any advice? There seems to be a simple solution in settings for multisite but not for single sites.

In terms of the php.ini solution I have found that this causes problems with the Defender plugin in the past

Thanks