If this is a deprecated functionality issue you might want to try installing the Classic Editor plugin i
Yes I’ve tried that. On some other sites I am happily using Classic Editor or Gutenberg, it’s just this one site where the blocks don’t suit my style of writing/coding and I’m aware that Classic Editor has a limited lifespan. I also have a feeling the site has slowed down, so being able to revert to 4.9.9. will allow me to do some comparison tests.
Some pages that I edited after converting to blocks ended up being a bit of a nightmare so basically I just wantb to go back as I don’t currently have the time to get to grips with sorting those issues.
If 4.9.9 ever becomes incpmpatible with my plugins is EOL, hopefully be then I may have sorted out the blocks issues and if not then evalaute what I do going forward.
I am using PHP 7.3
many thanks for the link I’ll try that.