MAMP Pro 3.05 on Mavericks updated to Yosemite - Apache does not start

Question

I have been running MAMP Pro 3.05 successfully in Yosemite up to DP4 on a partition that was a clean install of Yosemite.

I now have run the installer for DP5 over m

Answer 1

The approved answer didn't work for me because the _envvars file was already there. I had to download the latest version of MAMP and install it and it worked.