For Anybody running into Addon issues with the new release, Revert back to an older Construct Update. Click on the Pop Up link when loading your project, Click the link (LTS Release Page), Look for the previous Construct version and go to it, You'll be on an older version (It will instruct you to Update Construct 3) Dont do it.
If it doesnt Work still, Either Re-Install the Addons, If it already is, then the next thing is, Any addon you have applied to your game must align with Constructs 3 Version, Which means you have to go and Re-Download older Addon versions from your Devolper with Older versions of the addon, and make sure it aligns with Construct version.
Goodluck!