Sorry for late reply
You probably made the good choice with the annual plan .That's what I'm using too, the annual subscription for "The Slate Everything Bundle", the only downside is that you'll never own the plugins in the end, it's not like a rent to own plan, but you can pause your subscription when ever you want and when comparing the individual plugins pricing and the "Everything Bundle" offer + the fact that you'll have access to the new releases, it's really a fair deal I do think.
BTW they will be adding the "Liquid Sonics Lustrous Plates" reverb plugin to the bundle soon
Glad to hear that the tuts where helpful for you, James Dymond & Nate AKA "Protoculture" are both very talented producers and there's always a lot to learn from their courses here on Sonic Academy. For the specificity of the Slate "Everything Bundle" Nate did a very good work uncovering the use of the bundle for mixing & mastering, really should help if starting with the SD plugins
Cheers & happy mixing with your new SD plugins