[@Eric] I have version 5.3.2 from SOS, giveaway on 9/18/17, “Macrorit Disk Partition Expert Pro Edition”. Must have missed the April 2020 giveaway. I could find nothing on their site that mentions Disk Partition Expert or compares it with Partition Extender. So I don’t know if Extender has more features or less, or which is faster (they seem to think speed is their best feature – which is simple not very important for something you’ll run maybe once every six months or less). There’s a free version that doesn’t work for C: partitions (so it’s kind of pointless for most people).
I had a good laugh over the description of disasters this program keeps away from my PC: “Windows System Exception, blue screen, software conflict, bug, system crash, virus attack, power off, hard disk failure and others.” Seems like they are reaching pretty deep into the list of issues! If your system (C:) partition fills up, I could see maybe getting a system crash or blue screen that would require a power off. Maybe “software conflict” means programs are competing for space in the page file or swap file or virtual memory or whatever they call it these days, and one of them loses. If the program that fails due to lack of space is your antivirus, well, maybe you’ll get a virus attack (if it can find room to run). But ALL of these issues can occur while the program is running, or after partition expansion is finished. This program might help to some small degree, but to claim it keeps disasters away is quite an exaggeration.
If you use this, or any other partitioning program, please make a full backup image of the disk you plan to change.