Construct 2 was first released 9 years ago, in February 2011. Back then, Flash was still a dominant technology on the web; Microsoft's latest browser was Intern...
Probably been asked before - are there replacements for all Rex plugins? (or at least tween, pin etc) and how complex is the workflow once you try opening up a c2 project in c3?
As a C2 user who've moved to C3, I can say about 80% of the functionality is now available through new plugins, along with a whole bunch of new features that come with the engine, and newer plugins being developed by the people in the discord community makes C3 a much more feature rich engine.
You can have third-part Construct 2 add-ons in Construct 3 by asking their authors to port them using our SDK.
Otherwise, check the Exchange Addon or this dedicated forum (and this topic) to see if a port already exists.
Finally you can try this beta converter.
Once you have a Construct 3 version of the add-on, you can install it using the add-ons manager.