Several Plugins no longer work

After upgrading to the latest version of WordPress several plugins don’t work. I was planning on using Calprss pro so I could create a place for people to sign up for our flying events but am not able to do that. Calpress pro does not work in the latest version. I also want to be able to link to our pay pal account but again I am not able to do that. Any suggestions. I don’t mind paying for a plugin if it works but so far several say not tested with latest version.