You can try using 1.5, but from those errors there is a very good chance it would not work out. The reason is that the old 1.5 version required a version of PHP older than the current (<5.30), which is causing the Deprecated notices to appear saying that functions are not available. In the release of 5.30, many functions were deprecated because newer, better functions were available. When a function gets deprecated, it cannot be used.
1.6 might work, I'm not sure. If its compatible with version 5.30 then it will probably work. If not, then sorry but you might have to use version 1.7
There's nothing I can do about this, and we cannot 'downgrade' PHP just for one individual user.
Thanks,