In the MAC Catalina and MAC Big Sur operating systems, 32-bit apps are no longer supported. As such, GeCla will not work until it is upgraded to a new 64-bit version. We are working on it.
With the new version of the Mac operating system (Mojave), a problem arises if the GeCla folder created during installation is not inside the applications folder. When the installation is complete, check whether the GeCla folder is inside the applications folder and, if it is not, "drag" the GeCla folder into it. (If you have any installation problems, please let Atractor know - see contacts).