To answer your question, the Internet Connectivity Kit in particular was made for Garage Door openers that have purple or red/orange ‘learn’ buttons. It comes with an internet gateway (CIGBU) and a control panel (041A7928-3). The 45ACT logic board is a Security +2.0 logic board (it has a yellow ‘learn’ button). This is important to know because the 041A7928-3 control panel is not compatible with the 45ACT logic board, while the CIGBU is compatible.
Install your old control panel and disconnect/remove the 041A7928-3. Plug in the CIGBU and add to MyQ account, then add the garage door opener by pressing the yellow ‘learn’ button per the MyQ app instructions.