Can I use the TKS 80 SawStop Saw without the SawStop cartridge?

No, the SawStop feature of the TSK 80 is a vital safety feature of the saw so you will not be able to use your TSK 80 SawStop until the cartridge has been replaced.
To have the cartridge replaced contact your nearest Festool Dealern> or contact Festool directly through our Repairs Centre page here.