I suggest you use this procedure to uninstall Quicken and then reinstall it.
This problem happens for every Mondo Patch that was ever released, from R1 through R5, for Quicken 2017 Real Estate on a latest Windows 10 and on a 2016 machine. Yes, this exact problem listed above continually exists. Quicken needs to pay attention and correct this problem.
EVEN IF the user has a so-called corrupted installation on the windows machine, a Mondo patch is there for the exact purpose of fixing a corrupted situation. It still falls upon Quicken.
For me, since I have had Quicken 2017, a mondo patch no longer works at all, and I'm pretty upset about it. I do not like the updates that get downloaded via One Step Update because I've had errors in the past that way and I will never trust updates given to me that way ever again. So, for me, whenever there was an update, I went to download a Mondo Patch and then updated with that tool. It was always trustworthy.
I have had Quicken for the last 16 years....
A search of this on Google gives the best answer via StackOverflow; what ever string Quicken is using as a parameter is the wrong length. Seems some coder at Quicken should be able to fix the problem or give us a decent solution.
Once again, very bad support.
The install disk I purchased was R1; I downloaded, and installed, each of the R2 through R11 patches with success. However, either the R12 or R12 Mondo patches would work giving me the same error message "... parameter is the wrong length".
I tried using the One Step Update, however, that process stops because I have no online accounts to update and it just simply stops working.
I have successfully updated through R11 and have no idea where to go from here. If this is what can be expected from Quicken, I believe they are going to loose many customers in the future. This from a user since at least 1995, perhaps going back to 1991.
Once again, I appreciate your help and will keep an eye out for the use of your software ImportGIF.
Update: I finally was able to update to R12 through the program itself. I was forced to create an empty account and was not able to use One Step Update to simply update the program, of no, I had to sync my file up to their cloud before it would update the program. Stuuuuuuuuupid!
Once I installed the R11 update I could register Quicken 2016 with no issue. Then I did a "Check for Updates" from the Help menu and Quicken successfully updated to R12.
So the patch files for Quicken 2016 R12 on Quicken's own website are broke. Why they haven't bothered to build a new set is beyond me, other than they're probably too busy working on the September patch they've announced.