Upgrade Concrete 126.96.36.199 to current
I am completely new to Concrete5. I have a new customer that has come to me with an old website version 188.8.131.52, and I would like to try to upgrade it to the current version. I have read through some of the documentation and made one failed attempt. The documentation mostly talks about upgrading from much more recent versions. I'm looking for advice on how to proceed, if it is feasible, will the theme need to be rebuilt, and any other suggestions or advice.
There were breaking changes several years ago across versions which means there is no automatic way to achieve this.
No 5.6 themes or add-ons will work with the latest version, so you'd be best to rebuild the entire site on the latest version, including re-building the theme, or purchasing one from the marketplace.