The Roxio folder in my Program Files shows 56,230,000 bytes (DOS) for the whole thing. Nearly all of that is in the "Easy CD Creator" folder, with incidental bits in 3 other folders. Thats for "Easy CD And DVD 5 Platinum."
The other half of your 100M could be reserved for buffer? I don't know how much the program needs, but I suspect at least 5% of the 700MB you can burn would be nice.
The Adaptec folder on my laptop (Easy CD 5 Basic, CD only) shows about 6,733,000 installed, but I haven't checked for "remote" files.
I installed the CD/DVD version (that machine came with Nero). There may have been some video functions that I left off, since I don't have any compatible other equipment; but so far as I recall, it was a "default" install.
The laptop, CD only version, is what came on the machine (and I added Nero). It's probably a "stripped down OEM" version.
I can still recall taking my version of Word to the office on a 1.4M floppy (with a couple of .doc thrown in to work on), but them days are just a memory - and at my age that's getting pretty dim.