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...
What a pity. I paid for my early Construct2 license about the same money a year license costs. I still use C2 to create small presentations and mini games, but I have turned to other technologies such as processing. I dont know if the small usage of Construct I make (primary on my summer vacation, when I don't have exams to check) is worth a yearly susbcription. Maybe I turn to monthly subscription. Also, C2 works in my 2005 Pentium Dual core computer.
What concerns me more is the fading out of C2 engine in C3. My best C2 game, jigsaw puzzle, uses a plugin not adapted to C3. Until june I will be able to compile it with C3, but after that I will be unable to do it.
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.