URM is not going to support older versions or Ren'Py. Check this FAQ item:
Exception: 0x52: Incompatible Ren'Py engine version
When you get the exception "0x52: Incompatible Ren'Py engine version" when starting a game it means that the Ren'Py version used by that game isn't supported by URM.
You could try upgrading the Ren'Py version as explained here.
The minimum supported Ren'Py version never really changed, but you can get any version of URM throughThank you for informing me of this, is there a way to get the previously released URM (URM v1.15.2 and prior), as currently I am finding the new versions v2.1.3 and v2.1.4 Beta.
You must be registered to see the links
. Click "load full history" under the changelog and you can then click any version number to switch to that version's download page.