No error but trying to use the loop sprinkler system doesn't work. It shows the loop only on the right side and it will not adjust when clicking the arrow buttons.

Runtime error 340: control array element of '21' doesn't exist.

Runtime Error 380 Invalid property value

Runtime Error 94

Runtime Error 380 Invalid property value

Runtime error 5 on opening of HydraCALC Sizer.

When running a calc, you first get this error indicating a number of possibilities.

Then the Pre-calc Questions window pops up with a warning.

But you go ahead with the calculation anyway and get this result

Your System Has a Deficit

System is -nan(ind) psi over the Water Supply Curve

When selecting the menu [Help|User Manual], you get the error message;

Fitting Definition Trying to Read PDF's

Error while trying to open Acrobat Reader.

Install Acrobat Reader and try again.

Running calc displays this error:

Please confirm your Remote Point reference point has a k-factor or flow and pressure

When printing a final calculation, the font doesn't show fraction symbols for ¼ (quarter), ½ (half), or ¾ (three-quarters)

They're replaced with ?.840, ?1.050, and ?1.660

These should look like this;

Of note, if using HydraCAD for AutoCAD, you get similar results on riser nipples/vertical pipes