Indicators applets 16.04 to 18.04

It's possible to install the old applets from 16.04 to 18.04?

Which exactly applets do you mean?
Did you tried right click on the MATE PanelAdd to Panel to add applets to the panel?
Do you mean icons inside Notification Area applet?
Do you mean indicators (guake-indicator package as example)?

If you've disabled the indicator-session applet as we spoke about in a previous thread, then MATE Tweak should let you select the GNOME2 panel layout.

This happens only if you've removed an indicator completely or if you've disabled one. Before disabling, I saved a custom panel layout as you can see in the above screenshot.

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