You can switch your WordPress installation to ClassicPress as a choice Content Management System (CMS). There are reasons as to why that I shared here about moving from Gutenberg.
However, due to some slight changes in file structures in ClassicPress, you might have errors that the switch plugin highlights. Here is how I solved a conflicting files issue reported by ClassicPress Migration plugin in under 3 mins.
Have you experienced any other installation errors? What are they? Did you solve them? Please let me know in the comment section.