Embedded version of Git for source tree will not update to same version as colleague

[Toby Johnson]

Hi I'm working with somebody in Spain and I'm based in the UK. I've been trying to setup source tree as a local client and gitlab as the cloud repo. I've been able to push him a small repo and he's been able to upload an image file to the repo. But when he go's to upload a large amount of files he keeps getting an error message. 

I've been advised to edit the config file to a larger packet size locally but when he installs the embedded version of git into source tree he is on a different version 2.0 (Git is also installed via the git website as a 64 bit version). the embedded version or 64bit version does not give him a config file locally in the etc folder. Where as I'm on a 2.26.2 embedded version with a config file that allows me to edit it on my end and have the 64bit version installed.

Is there a way of getting him onto the same version enabling him to access the config file? 

If anybody could be of any help it would be greatly appreciated, thanks in advance.