You can divide it to 4 parts and pack it into rar or zip archive. Then upload each part.
__________________ Love is patient and kind; love does not envy or boast; it is not arrogant or rude.
It does not insist on its own way; it is not irritable or resentful;
it does not rejoice at wrongdoing, but rejoices with the truth. Corinthians 13:4-6
Don't make many parts. Just upload a standard single rar zip or 7z file to your google drive, change its sharing attribute to 'anyone with link', and upload a screencap of the image to the stash and select 'theme' as type. Now fill in the blanks just like you are uploading a theme; all images, etc., and include a link to the file. You can create a post at the forum as well.
There are lots of themers using similar methods for large themes.
How to upload my theme?
Hybrid Mode
