If you're using these older titles, you can upgrade to the equivalent Yenka version.
Network Installation: network installers are available for MSI and RM CC3 networks.
Yenka File Converter: Download and install the Yenka File Converter, to open old electronics circuits saved as .cyt (Crocodile Technology) and .cyp (Crocodile Physics) files. Note: You do not need to install this file converter if you want to open .cxt and .cxp files.
PCB routing and PIC Programming: Please note that PCB routing and PIC/PICAXE Programming are not available in the Mac versions of Yenka. Also, there is no Mac version of the file converter for old electronic circuits (*.cyt or *.cyp files).