Digital Analytics Misc.
fdails@daoftx.com
In typical downloading cases you will get a warning from Windows about an "Unknown Publisher"! This is because I am currently less active and have never taken the time and considerable expense to have an official Microsoft encrypted "certificate". You must override all the dire warnings that Windows gives. As some of the historical notes in this website may show, I worked on some of the applications offered since the mid-1980's, before there were such things as internet and downloading.
To check whether you are getting the exactly correct file without any added malware you can check the file that you download using the hashfile algorithm approach provided by Microsoft. You (a) download the file to your chosen location; (b) Open a Command Prompt window or "PowerShell" and change its current folder to your chosen location; (c) give the command (for example, for the free quick calculator)
certutil -hashfile QC202.exe
which gives results (if the downloaded file is correct)
SHA1 hash of file QC202.exe:
05 17 15 c2 68 b0 93 a5 0c 3f 6d ea b8 5d 9b ec d8 47 98 1d
My Windows 7 and also Windows 10 give the SHA1 version of hashfile results. If the resulting hexadecimal is exactly the same as what I list in the table at the end of this page for QC202.exe, then you can be sure you are getting the unaltered self-extracting software (and all these files have been scanned for malware). Two files with the same hashfile algorithm result have a very very high probability of being the same. Unfortunately I see that researchers have found an even higher probability algorithm, SHA2, and it appears that Windows 11 has switched to this, negating the usefulness of the table.
When you download the file, your browser attaches something to the original file called a "Zone Identifier" which triggers the danger warnings. If you download or copy into a flash drive that has an older-style Microsoft file format (e.g. FAT32), "Zone Identifier" is not supported, and you get the original file which you can install without warnings.
Quick Calculator 2.5, Non-demo Flash Calculator, and DMSolver ask you to register with me at the start of your free 30-day use period and again later if you decide to purchase a license. These are serious software packages embodying years of development and are copy-protected. You send me by email a set of codes from the installer, and I send you unlocking codes back.
There is no typical online sales mechanism in this simple website. To make a purchase let me know by email. You will get a PayPal invoice which you can pay by credit card (including using non-USA currency). Then you run SETUP.exe again for a new set of codes and I send you new codes back.
None of our software puts any hidden system files or registry entries into your system, so if you delete all the files, it is uninstalled.
Likewise BOAT3D is a serious effort by 2+ people over many years. For it we offer subscriptions over fixed periods. During the subscription period the user is entitled to current upgrades and a reasonable level of support. Contact us by email or other means to request a subscription. 30-day short-term trial subscription .......$300. To subscribe to use BOAT3D for longer periods, please email me for current policies.
The following downloads below are self-extracting .exe files. When you run them they first ask you to specify a new folder into which the software is installed (specify an existing folder if you want to upgrade).
Download:QC202.exe Quick Calculator 2.02 free application
Download:b3ddemo2.exe Shows a sample of BOAT3D output
Download:edt375dm.exe EDTECH 3.75 free application
Download:Lazarus 3.6 with Free Pascal 3.2.2 courtesy of the Lazarus and Free Pascal developer groups, (see lazarus-ide.org and freepascal.org). They carry a modified Library GNU Public License. (This version is specifically the 32-bit Windows one that I use, needed for dms604)
Download:flsc213d Demo Flash Calculator free application
Download:QC251.exe Quick Scientific calculator 2.51 with unit conversions(about 1100K, 30-day free trial period but you must register for this.) After the trial the price is $30.
Download: flsc214.exe Full-featured Flash Calculator (About 970K, 30-day free trial period but you must register for this.) After the trial the price is $150.
Download: dms604.exe DMSolver 6.04 simulation system (About 3M, needs a Lazarus with Free Pascal V3.2.2, optionally uses EDTECH, 30-day free trial period but you must register for this.) After the trial price is $300. (...versions...Lazarus changes frequently...Free Pascal does not..but you should use the one I provide...because compilation dates are important)
Note--I am required by law to charge 8.75% sales tax to Texas residents.
In a command prompt window the command for file "filename" is certutil -hashfile "filename" (omit quotes).
SHA1 hash of file QC202.exe:
05 17 15 c2 68 b0 93 a5 0c 3f 6d ea b8 5d 9b ec d8 47 98 1d
SHA1 hash of file QC251.exe:
ad 1f ed 9d 92 21 e7 78 85 4d 52 fa 58 25 f2 f5 97 82 5d 59
SHA1 hash of file lazarus-3.6-fpc-3.2.2-win32.exe:
e9 1e 44 6b 8c 66 da 7c e2 2b c1 29 b6 79 2d 67 11 4e c2 68
SHA1 hash of file flsc213d.exe:
80 c2 53 32 d2 9d 30 d1 b7 5c 15 99 65 0d 5b 8f ea a6 bb a3
SHA1 hash of file flsc214.exe:
fe f3 fe 20 0e 03 31 b0 10 2b 3f a5 dc 50 87 c3 07 b6 21 14
SHA1 hash of file dms604.exe:
08 ab 69 4b a3 2d 94 9a 6f 4b 93 d7 62 a3 42 bb 94 0e 0c 5a
SHA1 hash of file edt375dm.exe:
7d 96 2a bb d9 0d 59 39 62 18 a7 bb d6 6c 31 99 ef d2 80 09