I have exactly the same problem! I follow the right way to extract and install the library (from diffenrent source : github and another with your own site tranfert ) … and … ‘EasyTransfer’ does not name a type.
the easytransfer.h file isn’t in the right place and that was the quickest fix i was still writing my code so the code had no name and i used softeasytransfer because i can direct the rx and tx pins then i click sketch then add file and added the .h and .cpp files. u may need to copy and paste your code to a new blank arduino window hope that helps