FREE conversion programs will have some limitations and few features.
You can try VSO's uninstall program to remove Convertxtodvd (and other VSO programs), reboot, then manually delete the leftover folders from VSO, then use CCleaner to remove any leftover registry entries, reboot and then install with the latest version of Convertxtodvd.
Here is the link to the program called CleanVSO:
http://download2.vso-software.fr/CleanVSO.exe
It also goes without saying (but I'm gonna say it anyway!) to make sure you don't have any virus/malware running on your system that could corrupt memory causing a conversion error. Malwarebytes has several very good FREE programs you can run to see if your are clean of those little nasties!!!
Also, close ALL programs before doing a conversion, such as any anti-virus/malware program (Windows Defender is crap, ALWAYS disable it), turn off defragging programs, disable screensavers (default power saving options should be ok), and any other programs that can be closed or disabled. You want the conversion program to have MAXIMUM resources and ALL cpu/gpu cycles to do its thing. When you start the conversion, leave it alone.
And looking at your log file, ENABLE "Use 2 pass encoding", ENABLE "Use hardware decoding (if possible)", change your "Encoding options:" from "AUTOMATIC" to "SP (Short Projects)" unless your movie is 160min (or larger then choose the next bigger size), then manually change it to MEDIUM PROJECTS but I would keep your DEFAULT encoding to "SP (Short Projects)", DISABLE "Burn result to disk / as ISO file in working folder" unless you WANT it as an ISO file. I always play my DVD files with WinDVD BEFORE burning to make SURE the conversion was good before burning it. Also, HARD code your VIRTUAL MEMORY size in Win 10. By default, ALL versions of windows constantly adjust the virtual memory size, which increases disk activity and can cause other issues. That setting will depend on how much REAL system memory you have. Go into the virtual memory setting, see what Windows thinks is the optimum setting and hard code it for a number as close as possible to that, by a multiple of 1024. For example: if it suggests you should set it to 11,563, then you should go with 11,264. Which is 11 times 1,024.
There are other options in Converxtodvd to allow you to use ALL your cpu/gpu cores, max those out.
Hope some of this helps.