I'm going to talk a LOT more about this at MOTM in February, but quick and dirty here's how I setup DropBox so I can install to customer site without worrying about getting a virus.
a. Create a DropBox for $99
b. Request that we share our UPGRADE folder to that DropBox
c. This goes to you as a READ ONLY (no chance of getting a virus from someone installing to a customer)
d. Install DropBox to your customer site
e. Let it synchronize all the files you need
f. Optionally copy the files out of the folder and into a separate area accessible for those using/installing/upgrading MAS90
I do this on every project and it's a huge time saver. Even before I get the check I ask for remote access and I just install DropBox and let it sync all my Sage 100 related files.
Note: There's a bunch of other things to consider - namely that when you install DropBox to a CUSTOMER site you want to use an account that ONLY has Sage stuff in it. You can selectively synchronize folders BUT the customer can right click on the desktop and gain access to everything in the DropBox..... For that reason I do NOT put my personal/company DropBox on a customer system but instead I have a second (paid) DropBox which I put on there and which only has the UPGRADE (read only) folder shared from our 90 Minds DropBox.
More in Februrary 2016 at MOTM - including how I'm using the new Basecamp project management for every single project request from a customer.