Here's a link to the version with the old cover: https://drive.google.com/file/d/10N1r5rjWMCUHc6oW7sfGim9MFxdwt_6C/view?usp=shari...
The supplements are each year-long campaigns. A few have new rules/procedures (like running extended large battles), but none of that is vital, and a lot of it is a conscious step away from RuneQuest lore, being inspired by other books and games.
If you want to run Dragon Pass stuff, I honestly think your best bet is to get the Chaosium supplements for the region and do some quick conversions.