Question: how to install etka 8?
Answer: Install ETKA 8 with from ETKA8_Germany_International_2018 , instructions can be found here: ETKA 8.1 Electronic Parts Catalogue Download FREE.
If you receive DLL error, use DLL-PATCH. ... 
Use ApplicationX64 if you have 64bit OS.
Use ETK8_2018-V1_CORRECTION-INT to fix shortcut issue.
Launch ETKA8 and make sure it's working.