instali

Instali is the everyday word for putting equipment, furniture or software where it belongs and making it work: instali programon, instali lampon, instali novan sistemon. The older human sense survives too, so a bishop or a director can be instalita in a post, and instali sin is to settle yourself somewhere.

Now the false seam, because this word invites one. Instali looks decomposable into inst- plus a suffix -al-, and it is not. Esperanto has no suffix -al-. The -a at the end of an adjective is a grammatical ending, not an affix, and there is nothing here to peel off: the root is instal-, borrowed whole. If you want the noun, you add a real ending to the whole root - instalo the act, instalaĵo the installed thing, instalilo the installer program.

That distinction is the single most useful habit in Esperanto vocabulary. A word either decomposes into roots and documented affixes or it does not, and guessing wrong invents words nobody uses. When you meet a long international borrowing, check whether the pieces are real affixes before you trust the seam.