When I opened TI_Pspice yesterday, I was told that there was an updated version, which was then installed. I seem to recall that it was called "2021.2", but perhaps I am mistaken.
Since then, I have had to perform a Windows system recovery, which I suspect has wiped out the 'updated' version and left me with the old one.
Unfortunately, there appears to be no "check for updates" option in the HELP drop-down menu. And, I cannot seem to find any indication of what the current version number is, anywhere on the TI or Pspice website.
It is also very confusing that the version number from 2020 (#17.4) is the same as the version number of the latest version (#17.4....see screen-shot, above!), even though my very first download of TI-Pspice was April 9th, and the update that I informed of (yesterday) must've been released in the past week. Which would've made the update a 2021 version, of course.
The version numbers----- which appear from the screen shot to have not incremented in the past year--- could be the result of a simple typographical error. The screen-shot below, from the "About..." field of 
the HELP drop-down, says it is a 2021.1 version, whereas the fine print at the bottom declares it to be "17.4-2020 S006 Windows SPB 64-bit Edition"
If anyone can sort this out, I would appreciate it, particularly as TI-PSpice may 'think' that I am running the latest version (as it was offered to me, download and installed) and, if it was in fact wiped clean by the Windows "system restore", I may not be offered another opportunity to update (until, perhaps, another version is released!).
