There are support forums at at the SourceForge http://sourceforge.net/projects/portablegvim/:
The author can be emailed at portablegvim@users.sourceforge.net.
If you appreciate my work on GVim Portable and want to encourage me working on it more, you can either send me greetings, patches or make a donation.
Make a donation if you really like GVim Portable and the money doesn't hurt, otherwise just use it, recommend it and like it.
I am a member of the Free Software Foundation an I will re-donate 10% of all donations to the Free Software Foundation.