The older lines and bi-directional arrows were very professional looking. The lines could be grabbed and curved. I used on How-To instructions. I can't give a screenshot as this was removed before version 12 and that is the oldest one I have.
I believe what you're looking for is the SnagIt 10 Paint tools. They were downloadable.Problem is,the link is no longer working and SnagIt 2018 won't install them anyway. Version 13 will but glossy callouts and several text callouts have compatibility issues with regards to formatting.
You can create all of those styles in 2018 and save them as a Quick style. It 's not as easy as a download and install.But I'm afraid that's all you've got.Select arrow styles from the drop down menus.Chose a color, size,etc. And save it as a quick style.