FWIW, we just released TDC #9 last month, so the stuff on archive.org is now pretty stale.
Each release supersedes each previous release as files get renamed due to typos and other fixes happen to the collection.
You'll need to look on other sites to locate the download though.
Please keep an eye open for that shoebox of floppies in the back of the closet for me- there may be undiscovered gems out there that haven't yet made it into the collection.