Installing the CSP into my steam scn directory worked nicely... you may want to change the line in your top post that states "Sorry Steam users but you only get the new scenarios and the 9 updated scenarios updated to the latest DBs" into a hopefully clearer statement such as...
"Steam users can ensure that all of their CSP scenarios use the latest DB's by downloading the standalone CSP and extracting into their Steam client CMO scenario directory. The zip extraction will create a folder named 'Community' or you can use a new folder name of your choice. You will also want to extract the contents of the 'Lua' folder into your 'Lua' directory in the steam install. Do not just overwrite the Lua directory, as it may already contain other files."
Some big changes to CSP 45 in regards to Steam. One of the other devs has given me a utility that can either update multiple scenarios at the same time OR (in my personal opinion the most exciting part) upload multiple scenarios as a single entity download. What I'll be doing for CSP 45, is removing all of the individual scenarios from Steam, and converting them to the single download.
I'll be updating that single entity going forward. Once you subscribe to it, that should be it. There will no longer be the need to go and subscribe to each individual CSP scenario in the collection when I update the pack, plus you'll get all the scenario updates. Another major advantage of this is you will get all the scenario documents and attachments. Although because its Steam, they will get placed in your Steam workshop folder and not the Command installation folder.
Currently aiming to release CSP 45 the first week of November.