Hi there Mike, welcome to the forum.
The vast majority of schematics will work just fine if you click to allow the file to load normally. There are some rare occasions that updated components will slightly change the behaviour of a design, hence the warning - but the phrasing of the dialogue makes it sound a lot scarier than it really is!
In fact, if you take a look inside the knobs, there is one 'obsolete' component in there - the "Developer" primitive - it has a red/white stripy border to show that it has been superceded. In many cases replacing superceded parts with the latest equivalent from the toolbox will fix any problems - but in this case it is not necessary, as that primitive does nothing to the performance of the plugin, and no longer exists - in fact, it can be safely deleted.
(The "Developer" primitive was a 'marker' used for a special 'novice' mode that hid some of the modules in the toolbox; this mode was discarded after OutSim realised that it just led to lots of bug reports from users who thought that their toolbox had got corrupted!).
If you do still have problems with the schematic, just post again - there are many 'old hands' here who are familiar with the ways of the older versions of SM, and they are generally not too hard to fix.
Feel free to use any schematics and algorithms I post on the forum in your own designs - a credit is appreciated (but not a requirement).
Don't stagnate, mutate to create. Without randomness and serendipity the earth would be just another barren rock.