HTML Designer Pro 26.2 is a fix release, on the Windows page today. It is the same app as 26.1, with one problem put right.
Closing the app no longer crashes
On some PCs HTML Designer Pro could crash at the very end, while closing a window or quitting. The reports you sent from the app pointed straight at the cause. Closing is now steadier, and Windows no longer tells you that the app stopped working when you close it.
Getting it
Copies installed from this site update themselves: the app says a new version is out, downloads it, checks its signature and installs it, or you can ask straight away from Help › Check for Updates…. Store copies are updated by the Store. If something still goes wrong, tell us through Help › Send Feedback… or on Discord.