Stacker 2.0 Disk Capacity Doubling Software, 3.5" and 5.25" Disks

This is a data compression software for DOS and early Windows from Stac Electronics (1991, Ver. 2.0). It approximately doubles hard disk capacity. It comes on both 3.5 and the now very rare 5.25 floppy disks.
In the early 1990s, hard disk capacities were around 20-40MB. Therefore, this was a widely used data compression software to solve the problem of insufficient disk space. It was said to provide approximately double the capacity and also improve disk performance through data compression.
I remember this software being very useful back in 1991, but I can't recall which DOS machine I used it on. It's not necessary today, but if you have a machine from that era and need it, please consider it.
I do not have a test environment, so I have not confirmed if it can be installed successfully. The labels on the 5.25 floppy disks appear to be discolored.