Back before USB drives, when 3.5 inch disks were the norm, I’d usually need to use a file splitting utility to break-up a large application before transferring it to another computer.

File Splitters can still be useful nowadays when you need to upload something to a site which has an arbitrary size limit set  such as 10MB or similar. Plus the same utility that you used for splitting can also be used for merging too.

There are a lot to choose from but currently this is the Splitter I’m using which is completely free.