1. Select a suitable root directory for installation. Help files in qcad (5.1) suggest /opt as probably suitable. I followed that suggestion. The tar ball for demo version or for pro version on my amd64 is located in a subdirectory of Documents directory:
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For the demo version:
/home/ak/Documents/downloads/CAD/qcad-2.2.2.0-1-demo.linux.x86.tar.gz/
The pertinent tar ball is copied to the /opt directory, extracted into subdirectory, which is then renamed qcad. It is advisable to carry out all the operations as root (aka "superuser"). The steps for the demo version are:
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1.1 cd /opt
1.2 cp /home/ak/Documents/downloads/CAD/qcad-2.2.2.0-1-demo.linux.x86.tar.gz ./
1.3 tar -zxvf /home/ak/Documents/downloads/CAD/qcad-2.2.2.0-1-demo.linux.x86.tar.gz
1.4 mv qcad-2.2.2.0-1-demo.linux.x86.tar.gz qcad
Of course, it would not do any harm to check that these steps worked by looking at the results (with "ls" command or something similar).
2. The program can now be started in CLI (aka "Console") whilst the present work directory is /opt ("pwd" will verify what the present work directory is). In openSUSE the default promt for the root user would probably be "/opt #"):
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For the demo version:
2.1 /opt # qcad/qcad-demo &
For a full version the command is:
2.1 /opt/ # qcad/qcad
The last step (2.1) can be replaced by creating a link to application (qcad) on the desktop and editing the Properties -> Application -> Command to show '/opt/qcad/qcad'
Step 1.2 for the pro version looks a little different, as "-demo"is replaced by -"prof".
If you are familiar with Linux, please forgive me for writing this in such detail: my hope is that some CAD users will switch to Linux because of this fine, relatively inexpensive CAD program!
Disclosure - I have no pecuniary interest in this enterprise.
OldAl.