I'm announcing the shutdown of the seasidehosting platform. We will keep
it running until the end of September so that people can retrieve their
data. Seasidehosting will stop serving requests on October 1 2019.
There’s a web site that has a how-to on setting up on Digital Ocean, it’s https://smalltalkzen.wordpress.com/. A bit dated, but I set up a seaside instance 3-4 years ago using the instructions there. I think they were fairly accurate back then.