Running a 16-bit DOS software on Windows 10 64-bit

Hello,
isn't there a trial version?

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“Take your chance, seize your happiness and go towards your risk. By looking at you, they will get used to it.” René Char

see the site http://www.dbase.com
There is no TRIAL version, the current official price is $149, but I often receive promotional offers
I can only tell you that it works very well.

MS-DOS was most often found on a floppy disk. I experienced the large 5.25-inch floppy disks (very flexible) of 256 KB around 1980, then the 3.5-inch rigid floppies of 512 KB, but also the first hard drives (5 to 20 million bytes).
If you have a 3.5" floppy drive (generally designated A:\), you can easily boot with MS-DOS, or one of its free clones that are easily downloadable: DR-DOS, FREE-DOS, 4DOS.
The executables are .EXE, .COM, and possibly .BAT files.

Under WINDOWS 10 (or 7 or 8), you have the equivalent of MS-DOS, under the <windows key=""> -- RUN -- type CMD.
A (black) window opens and you have nearly what you would have by booting MS-DOS, with some pros and cons.

The essential problem is that the old applications (the .COM and .EXE) from that time, which are in "16-bit" format, do not work at all with a WIN-10 64-bit. They, however, work with Win-10 32-bit (included in WIN-10 PRO at about €150) and of course with WIN-XP (but which is abandoned by almost everyone).

But the interest of DBDOS from DBASE.COM is that it adds functionalities that do not exist in original MS-DOS: PRINTING (on USB or Network printers), USB drives, access to large capacity disks (MS-DOS only recognizes small disks in FAT16), sound management, etc. ...</windows>

Do you know DOSBOX or what? At least DOSBOX is free.

YES, DosBOX is pretty good too, free, but you need to know how to set it up;
in particular, there is a parameter set too low (number of cycles) by default, which gives terrible performance (on my 10-year-old PC, with a Pentium Core E7400);
I had to increase it from about 4000 to 50000.

As today, there were millions of businesses using professional software: accounting, client files, invoicing, etc... Including technical drawing software (Turbo-CAD for example), and data management software, of which the three most well-known are: DBASE (DBF) and its variant CLIPPER, PARADOX, FOXPRO.
For the individual user, the only utility of DOS / 16-bit emulators is to run old games they experienced in their youth, or to continue using software they are comfortable with, without having to invest money (I'm thinking of alternatives to WORD or EXCEL for example).
For the professional user, it is to run old applications whose developer has disappeared, or has not ported them to WIN32 or WIN64, or has prohibitively high prices.
There is a nostalgic resurgence for old simple games like PacMan, etc...
For my part, my only necessity is to use DBASE3 to easily perform tasks on my personal application files (Accounting) and those of my association (Payroll, Accounting, Activities, Staff Planning, ....)

You will find a list of 3888 old games, several hundred of which run in DosBox, here:
https://www.dosbox.com/comp_list.php?letter=a

It's up to you to make your choice and find old floppy disks, or download them if you find websites that offer them!

YES, keyboard shortcut ALT + ENTER

or in the config file:

section [sdl]
fullscreen=true